Waves Review

Which portion of the visible light spectrum has the lowest frequency?

• red light (620 - 700 nm)

• orange light (585 - 620 nm)

• yellow light (570-780 nm)

• green light (495-570 nm)

Which of the following can also be written as 5.4 x 10^-7 m?

• 54 nm (54 x 10^-9 m)

• 540 nm (540 x 10^-9 m)

• 5.4 nm (5.4 x 10^-9 m)

• None of the above

How are electromagnetic waves produced?

• charges moving at constant speed

• stationary charges

• accelerating charges

• all of the above

Which of the following colors of visible light has the higher frequency: orange light or green light?

• orange light

• green light

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Which of the following is true about electromagnetic waves?

• They travel at the speed of light in a vacuum

• The amount of energy they carry is directly proportional to their frequency

• It has a continuous spectrum of different frequencies, which also determines the type of light

• All of the above

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Which of these is an example the Doppler Effect?

• A change in the apparent frequency of a sound due to the source's motion relative to you.

• A change in the apparent intensity of light due to the source's motion relative to you.

• A change in the apparent speed of light due to the source's motion relative to you.

• All of the above.

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A single photon of which form of electromagnetic radiation has the lowest frequency?

• gamma rays

• x-rays

• visible light

• radio waves

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What is the main difference between sound waves and electromagnetic waves?

• Sound waves are transverse, while electromagnetic waves are longitudinal

• Sound waves cannot travel through solids, while electromagnetic waves can.

• Sound waves need a medium to travel through, while electromagnetic waves can travel through a vacuum.

• All of the above

What's the relationship between a photon's energy and frequency?

• They are indirectly proportional E = h/f

• They are directly proportional E = hf

• They follow an inverse square law E = h/f²

• None of the above

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What is the difference in which a microwave oven heats your food to say, heating up your food under a food warmer (infrared light)?

• microwaves are absorbed by the water inside your food, causing friction, heating it up from the inside out. Infrared light is absorbed at the surface of the food, heating it up from the outside in.

• microwaves carry more energy than infrared light, so it heats up your food more quickly.

• microwaves have a shorter wavelength, and thus heat up your food faster than infrared.

• microwaves are ionizing radiation, while infrared light is non-ionizing.

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