Which of the following types of electromagnetic radiation has the shortest frequency? (2 points) Infrared waves Microwaves Ultraviolet waves X-rays

Answer:

cod

Explanation:

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The displacement of the ball is 45 meters elapsed time is 3 seconds, and the direction is toward the goal. Therefore, the average velocity is 15m/s. Therefore, option (B) is correct.

The velocity of a moving object can be described as a vector measurement of the direction and the rate of motion of an object. The velocity can be defined as the change in the position of the object w.r.t. time.

Velocity can be described as a vector parameter as it exhibits both magnitude and direction. A mathematical expression to determine velocity is shown below:

v = d / t

where d is the distance moved by an object, and t is the time.

Given, the length of the soccer field = 90 meter

The distance traveled by the ball from halfway down the soccer field,

d = 90/2 = 45 m

The time taken by the ball, t = 3s

The average velocity of the ball, v = 45/3 = 15 m/s

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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.

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.

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.

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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 :)

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.

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.

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.

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

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.

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.

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.

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:

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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.

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.

The true answer is C.

The boat is attracted to the magnet by the force of magnetism.

Let me explain. If Ashley made the paper boat and place it on the water, gravity will try to pull the boat down, however no magnets are used in this situation.

Now if magnets are used in this situation and the paper clip is attach to the boat, rather than gravity pulling it down, the magnet will be pulling paper clip, causing the boat to move, so instead of gravity, it's magnetism.

Note: Magnets=Magnetism

Answer:

The answer is C

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

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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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

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.