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8th grade Electromagnetic waves: from radio to ultraviolet worksheet

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Electromagnetic waves: from radio to ultraviolet

Grade 8 Science Worksheet - Challenge Me

NameDate

Circle the best answer.

  1. Ari sorts five bands from longest to shortest waves: visible, radio, ultraviolet, infrared and microwaves. Which order is right?

    • Ultraviolet, visible, infrared, microwaves, radio
    • Radio, microwaves, ultraviolet, visible, infrared
    • Microwaves, radio, infrared, visible, ultraviolet
    • Radio, microwaves, infrared, visible, ultraviolet

  2. Now Bo sorts the same five bands from lowest to highest frequency. Which order is right?

    • Visible, infrared, ultraviolet, microwaves, radio
    • Radio, microwaves, infrared, visible, ultraviolet
    • Ultraviolet, visible, infrared, microwaves, radio
    • Radio, microwaves, ultraviolet, visible, infrared

  3. Jun compares radio waves, infrared, visible light and ultraviolet. Which carries the most energy in each bit of light?

    • Infrared, as it feels warm
    • Radio waves, as their waves are longest
    • Ultraviolet
    • Each carries the same energy

  4. Of radio waves, microwaves, visible light and ultraviolet, which carries the least energy in each bit of light, Kira?

    • Ultraviolet, as its waves are shortest
    • Ultraviolet, as its frequency is lowest
    • Radio waves
    • Visible light

  5. Luz says radio waves carry the most energy per bit of light, because their waves are so long. Agree or disagree?

    • Agree: longer waves hold more energy
    • Agree: radio travels the farthest
    • Disagree: radio waves carry no energy
    • Disagree: radio carries the least here

  6. Milo says radio waves travel slower than light in space, since radio waves are so long. Agree or disagree?

    • Agree: long waves move slowly
    • Agree: radio waves need air to speed up
    • Disagree: radio waves are faster than light
    • Disagree: they travel at the speed of light

  7. Noah says light needs air to travel, just like sound does. Agree or disagree?

    • Agree: light fades without air
    • Disagree: light can cross empty space
    • Disagree: sound needs no air either
    • Agree: waves need a medium

  8. Pia says ultraviolet races ahead of visible light in space, since its waves are shorter. Agree or disagree?

    • Agree: ultraviolet has more energy, so more speed
    • Disagree: ultraviolet cannot cross space
    • Disagree: both go at the speed of light
    • Agree: shorter waves move faster

  9. A space probe sends a radio signal and a laser light signal toward Earth at the same moment. Which arrives first, Tala?

    • The radio, as it is stronger
    • The laser light, as its waves are shorter
    • Neither: signals need air
    • They arrive together

  10. Zee reads that a telescope saw a star flare in visible light and in ultraviolet at once. Why did both arrive together?

    • Ultraviolet waited for the light
    • Air slowed the faster one down
    • They share one speed in space
    • They don't: visible light is faster
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8th grade Electromagnetic waves: from radio to ultraviolet worksheet – printable
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About this worksheet

Electromagnetic waves from radio to ultraviolet. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can put radio, microwaves, infrared, visible light and ultraviolet in order of wavelength and of frequency.
  • I can name an everyday use of each band, including infrared remotes and thermal cameras, and say what sunscreen does.
  • I can explain that every electromagnetic wave crosses empty space at the speed of light, and that shorter waves carry more energy per bit of light.

Standard: supports MS-PS4-2

Words to know

electromagnetic (EM) wave: A wave of light energy that needs no matter to travel

spectrum: All the EM waves lined up from longest to shortest

infrared: EM waves just longer than red light; we feel them as warmth

ultraviolet: EM waves just shorter than violet light; we cannot see them

frequency: How many waves pass a point each second

speed of light: About 300,000 km each second, the speed of every EM wave in space

Common mistakes

Your child read the spectrum backwards. Waves get shorter from radio toward ultraviolet, and from red to violet.

Your child mixed up infrared and ultraviolet. Infrared is just past red (felt as warmth); ultraviolet is just past violet.

Your child thought a radio, remote or oven sends sound. These devices use electromagnetic waves; sound is a different wave that needs air.

Questions parents ask

What is the most common mistake with electromagnetic waves: from radio to ultraviolet?

Your child read the spectrum backwards. Waves get shorter from radio toward ultraviolet, and from red to violet.

Are these 8th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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