Answers OC27 EarthSpace Sci-2001310-S2-NelsonElectromagnetic Waves

Lesson 8.3 Electromagnetic Waves Answers

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Which two electromagnetic waves are useful for diagnosing illnesses?

X-rays and radio waves

microwaves and gamma rays

gamma rays and visible light

radio waves and ultraviolet waves

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What do all electromagnetic waves have in common?

They can travel at the speed of light.

They have the same wavelengths.

They travel only through matter.

They have nonmoving magnetic fields.

Isla made a diagram to compare X-rays and radio waves.What should Isla write in the areas marked A, B, and C?

A: Has a longer wavelength B: Can travel only through matterC: Has a higher frequency

A: Has a higher frequencyB: Can travel only through matterC: Has a longer wavelength

A: Has a higher frequencyB: Travels at the same speedC: Has a longer wavelength

A: Has a longer wavelength B: Travels at the same speedC: Has a higher frequency

Which lists the waves in order of frequency, from highest to lowest?

X-rays, gamma rays, ultraviolet

radio waves, visible light, X-rays

ultraviolet, microwaves, gamma rays

visible light, infrared, microwaves

Frank and Lisa are analyzing the chart, which shows the speed at which light travels through different media.Frank says that light travels through diamond with the greatest frequency. Lisa says that light travels through air with the greatest frequency.

Frank is correct because light travels through diamond at the slowest speed, and speed and frequency have an inverse relationship.

Lisa is correct because light travels through air at the fastest speed, and speed and frequency have a direct relationship.

Neither person is correct because light does not change frequency when it travels through different media.

Both people are correct because light has both an inverse and a direct relationship with frequency, depending on the media.

Which describes the relationship between the frequency, wavelength, and speed of a wave as the wave travels through different media?

As speed changes, wavelength changes and frequency remains constant.

As speed changes, frequency changes and wavelength remains constant.

As speed changes, wavelength and frequency change.

As speed changes, wavelength and frequency remain constant.

Wave Y and wave Z are two types of electromagnetic waves traveling through a vacuum. Suppose the frequency of wave Y is about three times greater than the frequency of wave Z.

It is the same for each wave because the amount of energy transferred is constant in all types of electromagnetic waves.

Wave Y transfers about one-third the amount of energy as wave Z because energy and frequency have an inverse relationship.

Wave Y transfers about three times the amount of energy as wave Z because energy and frequency have a direct relationship.

It is zero for each wave because when waves travel through a vacuum, they do not transfer energy.

The diagram shows changing wavelengths along the electromagnetic spectrum.

Y: UltravioletZ: Radio

Y: Gamma raysZ: Visible light

Y: X-raysZ: Infrared

Y: RadioZ: Gamma rays

Which is the correct formula for finding the frequency of an electromagnetic wave?

f = c –

f =

f = + c

f =

The chart shows the speed at which light travels through different media.

water

air

glass

diamond

Remote controls rely on waves to carry signals and transmit information over short distances.

Answer not available

A lab technician needs to clean medical instruments that have been exposed to bacteria. Which electromagnetic wave would be most useful for this task?

infrared

radio

ultraviolet

microwave

Violet light has a frequency of 7.26 × 1014 Hz and travels at a speed of 3.00 × 108 m/s. The wavelength of violet light, rounded to the nearest nanometer, is nm.

Answer not available

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Lesson 8.3 Electromagnetic Waves Answers

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