Unit 3 Light & EMS Study Guide

What is light?

• Sound waves traveling through space

• A form of electromagnetic radiation

• Particles only

• Heat waves

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What is the speed of light in a vacuum?

• 150,000 km/s

• 300,000 km/s

• 3,000 km/s

• 1,000 km/s

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Which of the following has the longest wavelength?

• X-rays

• Visible light

• Radio waves

• Gamma rays

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Which type of electromagnetic radiation do humans see?

• Infrared

• Ultraviolet

• Visible light

• Radio waves

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Which electromagnetic waves have the highest energy?

• Radio waves

• Microwaves

• Gamma rays

• Visible light

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What happens to wavelength and frequency as energy increases?

• Both increase

• Wavelength increases, frequency decreases

• Wavelength decreases, frequency increases

• Both decrease

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Which instrument is used to separate light into its component wavelengths?

• Spectroscope

• Telescope

• Microscope

• Radiometer

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What information can astronomers get from analyzing spectral lines?

• Composition of celestial objects

• Temperature of stars

• Motion relative to Earth

• All of the options

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What causes the redshift of light from distant galaxies?

• The galaxies are moving towards Earth

• The galaxies are moving away from Earth

• Light loses energy as it travels

• Earth's rotation

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The Doppler Effect applies to

• Only sound waves

• Only light waves

• Both sound and light waves

• Neither sound nor light waves