Smoke alarms emit only alpha radiation, which has limited penetration power and is safe when contained, such as within the plastic casing of the detector. Inhaling alpha-emitting radioactive substances can be harmful, therefore strict containment like in smoke detectors is essential for safety.
It is important that smoke alarms only emit alpha radiation and not other types of radiation because alpha particles have limited penetration power, making them less harmful to humans when contained within a device. Alpha particles in smoke alarms are used to ionize the air and create a small electric current. In the event of a fire, smoke particles disrupt the flow of ions, which reduces the current and triggers the alarm. Many alpha-emitting substances are safe to handle because alpha particles can be blocked by simple barriers, like the plastic embedding in smoke detectors.
Inhaling or ingesting alpha-emitting radioactive dust, however, can be very dangerous as it exposes internal tissues to intense localized radiation, increasing the risk of cellular damage and cancer. For this reason, the containment of americium in smoke detectors ensuring that the radioactive material is not easily dispersed or inhaled is crucial to its safety in residential and commercial environments.
And this one as well
The small shock you feel when you rub your shoes on carpet and touch something is called by
A conduction
B insulator
C induction
D current
Please need help
When Jamie removes a woolen cap, his hair develops an excess of static charge Which of these BEST explains this phenomenon?
B
Because when a woolen cap rubs Jamie’s hair, electrons are transferred from Jamie’s hair to the woolen cap. As a result, his hair turns positively charged, and the cap turns positively charged. This happens because hair gives up electrons more readily than wool. Note that positive charges do not get transferred; only electrons can get transferred.
The electrons are transferred from Jamie’s hair to the woolen cap by triboelectric effect
What is triboelectric effect?Triboelectric effect, often referred to as triboelectric charging, is a form of contact electrification in which some materials acquire an electrical charge after being cut off from another substance with which they had come into touch.
It is also known as conduction where a negatively charged shares electrons with a neutral body when they are both in contact with each other.
Given data ,
Let the first substance be represented as Jamie's hair
Let the second substance be represented as a woolen cap
Now , the charge on the woolen cap is neutral
From triboelectric effect ,
When the cap is rubbed with the hair , the woolen cap produces static electricity and the excess charges will build upon the surface of the cap
As bound materials rub against one another, negative charges or electrons will be transferred.
Hence , the electrons are transffered from the hair to cap by triboelectric effect
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IF there are 10.0 g of source and 8.0 g of oxygen, how many moles of sucrose are available for this reaction
In the early 19th century Christian Doppler, an Austrian physicist, proposed a theory regarding the properties of a moving source of sound. This is now known as Doppler’s law or the Doppler effect. What does this law state? A) The loudness of a moving source of sound is independent of the observer. B) The frequency of a moving source of sound is independent of the observer. C) The loudness of a moving source of sound is greater as it approaches an observer. D) The frequency of a moving source of sound is greater as it approaches an observer.
Answer: D) The frequency of a moving source of sound is greater as it approaches an observer.
Explanation:
Doppler effect occurs when there is relative motion between source of sound and observer. The apparent frequency observed by observed is different from the actual frequency of the sound emitted from the source.
When the source and observer move closer, the apparent frequency is greater and when moving away, it is less than the actual frequency. Thus, the correct option is D.
The loudness is dependent on the amplitude of the sound which remains same.
Answer:
D!
Explanation:
its on usatest prep!
The picture below shows the positions of the Earth, Sun, and Moon during an eclipse.
What is true of the eclipse shown in the picture?
A) It is a solar eclipse, in which the Earth casts a shadow on the Moon.
B) It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
C) It is a lunar eclipse, in which the Moon casts a shadow on the Earth.
D) It is a solar eclipse, in which the Moon casts a shadow on the Earth.
Answer:
The correct answer is the option B) It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
Explanation:
A lunar eclipse is an astronomical phenomenon that occurs when the Earth passes directly between the Moon and the Sun, causing the Earth's shadow produced by sunlight to be cast over the Moon completely covering it. For this to happen, the three celestial bodies must be formed in a straight line.
Every year there are between 2 and 7 lunar eclipses. According to the position of the Moon with respect to the Earth's shadow, 3 types of lunar eclipses occur.
The difference between a lunar eclipse and a solar eclipse is that, in the first case, the Earth stands between the Moon and the Sun casting a shadow on the Moon, while in a solar eclipse, the Moon stands between the Sun and Earth, casting its shadow to a small part of the latter.
Finally, the correct answer is the option B) It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
Which of the follow represent a chemical changes
Answer:
C) steel turning to rust in salt air
Explanation:
The missing options are:
A) ice melting to form liquid water
B) water boiling to form steam
C) steel turning to rust in salt air
D) sugar dissolving into hot coffee
In a chemical change the atoms of the reacting compounds are reordered forming new compounds. In a chemical change, new compounds appear, but in a physical change not.
Then, change of states like ice melting and water boiling are not chemical changes.
During steel rust, components of steel, like iron, are oxidized, that is, reacts with oxygen forming oxides.
The dissolution of sugar into hot coffee is a physical change in which sugar molecules get further apart in the coffee, but they don't change.
A 140
B 78
C 186
D 124
Which statement is correct?
Material B is the least dense.
Material C is the most dense.
Material A is denser than Material D.
Material D is denser than Material A.
The correct statement is Material D is denser than Material A.
What is density of a material
Density of a material represents the amount of mass contained within a specific volume of that substance. It is calculated by dividing the material's mass by its volume.
This fundamental property, denoted as ρ, varies based on the composition and structure of the substance. For instance, metals generally possess higher densities compared to gases or liquids.
Hence we can say that Material D is denser than Material A.
question
The speed of light in four different materials is shown below:
Material Speed of light in thousand miles per second
A 140
B 78
C 186
D 124
Which statement is correct?
Material B is the least dense.
Material C is the most dense.
Material A is denser than Material D.
Material D is denser than Material A. ((my answer))
somebody help me . i hate science omg
As air is pumped from the vacuum jar the sound level of the ringing bell will decrease until it can no longer be heard . This happens because air must be present in the jar in order for
a) sound to be transferred
b) electricity to flow through the wires
c) the rubber to seal the jar
d) the bell clanger to vibrate
Answer:
A) sound to be transferre
Explanation:
As the vacuum jar is emptied of air, the volume of the ringing bell will gradually diminish until it becomes inaudible. This occurrence can be attributed to the fact that sound necessitates the presence of air in order to propagate. Sound, being a form of mechanical wave, relies on a medium, like air, to transmit its vibrations.
Final answer:
As air is pumped from the vacuum jar, the sound level of the ringing bell will decrease until it can no longer be heard. This happens because air must be present in the jar for sound to be transferred, hence the correct answer is (a) sound to be transferred.
Explanation:
Sound is a form of energy that travels through the vibration of particles in a medium, such as air, water, or solids. When the air is removed from the jar, the number of particles that can vibrate and carry sound waves diminishes, eventually reaching a point where there are not enough air molecules to facilitate the transmission of sound. Sound cannot travel through a vacuum as there is no medium to transmit the vibrations. In comparison to the speed of sound in various gases, the speed of sound in a vacuum is zero, because sound simply does not travel when there is an absence of a conveyable medium. Similarly, the demonstration of sound reinforcement when a tuning fork is placed against a table helps illustrate that the transfer of energy requires a medium. The same principle applies to resonance in containers of air; as the air inside resonates with the sound frequency, we are able to hear the sound due to the air amplifying the vibrations.
A 12 kg bowling ball would require what force to accelerate down and alleyway at a rate of 3 m/s²?
F=
M=
A=
What is the mass of a truck if it produces a a force of 12,000 N while accelerating at a rate of 4 m/s²?
F=
M=
A=
To accelerate a 12 kg bowling ball at 3 m/s², a force of 36 N is needed. The mass of a truck producing a force of 12,000 N while accelerating at 4 m/s² is 3,000 kg.
The question is asking us to calculate the force required to accelerate a 12 kg bowling ball and to find the mass of a truck given the force it produces and its acceleration. These problems involve using Newton's second law of motion, which states that the force on an object (F) is equal to the mass of the object (M) multiplied by its acceleration (A).
For the bowling ball:
Force (F) = Mass (M) times Acceleration (A)
F = 12 kg times 3 m/s²
F = 36 N (newtons)
For the truck:
Force (F) = Mass (M) times Acceleration (A)
12,000 N = M imes 4 m/s²
M = 12,000 N / 4 m/s²
M = 3,000 kg
What advantage does an organism have because of photosynthesis
Photosynthesis provides crucial advantages to an organism by producing organic carbon and releasing oxygen, serving as a foundation for almost all ecosystems. It also facilitates adaptations that allow for efficient energy capture, thus sustaining the food chain and life on Earth.
Explanation:The advantage that an organism has because of photosynthesis is significant. Primarily, it allows autotrophic organisms like plants, certain types of bacteria, and algae, to produce organic molecules from carbon dioxide and water using sunlight. This process not only provides the carbon necessary for organic molecules such as sugars, which can be transformed into other essential compounds like proteins and nucleic acids, but it also results in the release of oxygen into the atmosphere, a crucial element for most living creatures, including humans. Moreover, by converting light energy into chemical energy, photosynthesis fuels nearly all ecosystems except for a few isolated instances like deep sea hydrothermal vents.
Organisms have evolved various adaptations to maximize the benefits from photosynthesis. For example, many photosynthetic organisms have a mixture of pigments, allowing them to absorb a broader range of light wavelengths, crucial for those in competitive environments or with limited access to sunlight, such as underwater plants or those on the rainforest floor.
Ultimately, photosynthesis is central to the food chain as it is at the heart of most energy paths. The energy captured by photosynthesis is what powers the synthesis of ATP via respiration, which in turn fuels the biological activities of heterotrophs - organisms that cannot produce their own food. Therefore, directly or indirectly, photosynthesis is responsible for the sustenance of life on Earth, contributing to the continuous energy transfer among organisms within our ecosystems.
i need this as fast as possible
how are steam powered boats different from sailboats
which of the following places would u expect to have the coldest climate?
a. a place that is very close to the poles
b. a place that is very close to the equator
c. a place that is near the equator
d. a place between the poles and equator
Does light entering the other substances bend away from the normal line
what properties of semiconductors make them useful in electronic devices
how many electrons are found in a neutral atom of mercury-200
Answer:
80 electrons
Explanation:
80 electrons
So, there must be 201 - 80 = 121 neutrons. Since atoms are electrically neutral, there must be as many electrons as there are protons. A mercury atom needs 80 electrons to balance the 80 protons
Explain,in terms of particles,how heat is transferred through the glass wall of a boiling tube
find the value of y when x=3 to the following equation y=2-5x
Part 1: Between the moon and Earth, which has a higher maximum surface temperature?
Part 2: Using complete sentences, explain the reason for this.
Between the earth and the moon we have that the highest temperature is the moon, because it blocks the sun from the earth causing it to heat up more.
How is the average temperature of the planet measured?The average temperature of the planet is measured through the variation of the temperature of the sea waters. Scientists and researchers emit low-frequency sound waves through the deepest waters of the Pacific Ocean. There are strategic listening points at various locations on the other side of the Pacific that pick up these sounds.
What is the average temperature of the moon?The Moon has no atmosphere, so temperatures range from -184 degrees Celsius at night to 214 degrees Celsius during the day, with the exception of the poles where the temperature is constantly -96 degrees Celsius.
Earth has a lower average temperature than the moon. The moon has far more average temperature than the earth because the earths atmosphere blocks the suns radiation from directly hiting it.
See more about atmosphere at brainly.com/question/13958926
Answer:
Part 1 Answer: The moon.
Part 2 Answer: The moon doesn't have an atmosphere, meaning it cant let off any of the sun's heat, making the surface temperature very hot compared to Earth's.
Explanation:
I did my research, and this is correct. I hope I helped somebody :)
how can you produce more power than an excavator?
Answer:
If the work done by us is greater than the excavator in the given time then we can produce more power than excavator.
Explanation:
Power is defined as work done per unit time. Let’s take an example:
Case I:
If we do 300J work in 2 seconds and excavator 500J work in the same time then:
Power produced by us = 300/2 = 150 watt
Power produced by excavator = 500/2 = 250 watt
In this case power produced by excavator is more than us.
Case II:
If we do 500J work in 2 seconds and excavator 300J work in the same time then:
Power produced by us = 500/2 = 250 watt
Power produced by excavator = 300/2 = 150 watt
In this case power produced by us is more than excavator.
Hence, If the work done by us is greater than the excavator in the given time then we can produce more power than excavator. But it is very difficult to believe in reality.
Beryllium has a nucleus composed of protons and neutrons. Given the data, how many neutrons are in a typical Beryllium nucleus?
A) 3
B) 4
C) 5
D) 9
The speed of any sound wave as it travels through a medium is dependent mainly on the ?
12) Which is MOST LIKELY a solid at room temperature?
Select ALL correct layers.
Identify the intrusions in the rock layers.
A) J
B) H
C) G
D) K
The illustration shows a light ray striking an object.
In the illustration, the light ray striking the object is-
Question 15 options:
absorbed
stopped
refracted
reflected
In the illustration, the light ray is indeed reflected. Here's why:
Reflection is the phenomenon where light bounces off a surface and changes its direction. In the image, the light ray bends sharply back upon hitting the object, indicating this type of interaction.
Absorption occurs when light is captured by a material and converted into another form of energy, like heat. The illustration doesn't show any such energy dissipation.
Refraction refers to the bending of light as it passes from one medium to another, like air to water. The object appears solid with no clear interface for refraction to occur.
Stopped wouldn't be an accurate description as the light changes direction upon hitting the object. It continues propagating, just in a different path.
Therefore, reflected is the most fitting description for the behavior of the light ray in the illustration.
When are tides highest? a. during the moon’s first quarter phase b. when the sun, Earth, and the moon are nearly in a line c. during the moon’s third quarter phase d. when the moon is at a right angle to the sun
Answer:
b. when the sun, Earth, and the moon are nearly in a line
Explanation:
Due to gravitational pull of sun and moon, the level of water in seas and oceans rises above its normal level. This is known as tides. Highest tides occur when the sun, the moon and the Earth align in a straight line i.e. during New moon and Full moon. This is because in this alignment, there is maximum effect of gravity. Tide occurrence during this phase are also referred as spring tides.
At what point in the swing of the pendulum is the potential energy completely converted into kinetic energy?
A)
B)
C)
D)
What happens if different lights are shined through a prism
Final answer:
Different lights are separated into their individual colors when shined through a prism due to the phenomenon of dispersion. The prism refracts the light, bending different colors by different amounts based on their wavelengths.
Explanation:
When different lights are shined through a prism, they are separated into their individual colors. This is because the prism refracts (bends) the light, but not all colors are bent by the same amount. The bending of the light depends on its wavelength, with different wavelengths being bent by different amounts. This phenomenon is called dispersion.
For example, when white light is shined through a prism, it is separated into a rainbow of colors, known as a continuous spectrum. The colors are lined up side by side, with violet light being bent the most and red light being bent the least.
Overall, the prism acts as a dispersing tool that separates the different colors of light based on their wavelengths, allowing us to see the individual colors that make up white light.
Which of the following statements about asteroids is true? A. The asteroids in our solar system are spread out uniformly and are not grouped in any particular orbit. B. The majority of the asteroids in our solar system are found in the space between Mars and Jupiter. C. The majority of the asteroids in our solar system are found in the space between Earth and Mars. D. The majority of the asteroids in our solar system are found in the space between Jupiter and Saturn.
Answer:
Option (B)
Explanation:
Asteroids are the rocky materials that are present abundantly in an orbit between the planet Mars and Jupiter. This is known as the asteroid belt, which is comprised of millions of asteroids that move around the sun. They are of various sizes ranging from a few meters to about hundreds of kilometers, which can cause mass extinction if strikes on the surface of the earth. They move at a speed of about 80,000 km/hr and during this motion, frequent collision takes place and they are considered to be the remnant of the early solar system.
Thus, the correct answer is option (B).