Electromagnetic Spectrum

How are different types of light (radiation) arranged along the electromagnetic spectrum?

• By how fast they travel

• By their sources

• By the amount of energy they carry

• By how radioactive they are

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What is the difference between a wave and a particle?

• A particle is a discrete unit of energy; a wave is a continuous flow of energy

• A wave carries energy; a particle carries light

• A wave moves at the speed of light; a particle can move at a range of speeds

• A wave carries electricity; a particle carries a magnetic charge

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Place the following types of EM radiation in order, from lowest energy to highest energy: A) Visible light; B) Gamma rays; C) Radio waves

• A, C, B

• C, A, B

• B, C, A

• C, B, A

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Which of the following transmits energy using microwaves?

• 
• 
• 
• 

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Astronomers often scan the sky using devices called radio telescopes. What can you conclude about these devices?

• They send radio broadcasts out to distant stars and planets.

• They pick up radio waves emitted by stars.

• They are less powerful than optical telescopes.

• They can detect ultraviolet radiation.

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Infrared radiation can be used to take special pictures called thermographs. “Graph” means “image”. What can you infer about the prefix “thermo”?

• It means “light”

• It means “energy”

• It means “heat”

• It means “radio”

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What might happen if the ozone layer did NOT block the sun’s ultraviolet rays?

• Humans would be able to see in the ultraviolet range of the EM spectrum

• Devices that use electromagnetic radiation would no longer work

• The surface of the earth would be much hotter

• Rates of skin cancer would skyrocket

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What word best describes gamma rays?

• Weak

• Destructive

• Visible

• Harmless

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What do all forms of electromagnetic radiation have in common?

• Their strength

• Their speed

• Their wavelength

• Their frequency

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What produces electromagnetic radiation?

• Electrons changing energy levels

• Electrons bonding with other atoms

• Electrons leaving the atomic nucleus

• Electrons becoming protons or neutrons

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