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8th grade Electromagnetic waves: from radio to ultraviolet worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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Electromagnetic waves: from radio to ultraviolet

Grade 8 Science Worksheet - Building Confidence

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Circle the best answer.

  1. “Spectrum strip, not to scale, left to right:” On Bo's copy of the strip, the band between microwaves and visible light is blank. Which band goes there?

    • Infrared
    • Radio waves
    • Ultraviolet
    • Sound waves

  2. Spectrum strip, not to scale. Esme points just past the violet end of visible light on the strip. Which band is there, with waves shorter than visible light?

    • Ultraviolet
    • Microwaves
    • Radio waves
    • Infrared

  3. Jun changes the channel with a TV remote (found at last, under a cushion). Which kind of wave does the remote send?

    • Radio waves from a tower
    • Infrared
    • Sound waves
    • Ultraviolet

  4. Kira warms soup in a microwave oven. Which kind of wave heats the soup?

    • Sound waves from the oven's hum
    • Microwaves
    • Visible light from the oven lamp
    • Ultraviolet

  5. Luz listens to music from a radio station far away. What carries the music from the tower to the radio?

    • Ultraviolet
    • Sound waves sent through the air
    • Radio waves
    • Infrared

  6. Noah looks at the same rainbow. Which color has the shortest wavelength?

    • Violet
    • Red
    • Yellow

  7. A prism spreads Pia's lamp light into colors. Which order runs from the longest waves to the shortest?

    • Red, orange, yellow, green, blue, violet
    • Yellow, red, orange, green, violet, blue
    • Green, yellow, red, orange, blue, violet
    • Violet, blue, green, yellow, orange, red

  8. A far galaxy gives off radio waves and visible light at the same moment. Ren wonders which reaches Earth first. Which one?

    • The radio waves, as they are bigger
    • Neither: space has no air to carry them
    • Both arrive together
    • The light, as its waves are shorter

  9. Sunlight crosses about 150 million km of nearly empty space to reach Tala. Do electromagnetic waves need air to travel?

    • Yes: sunlight rides on the solar wind
    • No, but they slow down in space
    • Yes: like sound, they need matter
    • No: they can cross empty space

  10. Light travels about 300,000 km/s in space. Zee asks about microwaves. About how fast do microwaves travel in space?

    • About 343 m/s
    • About 300,000 km/s
    • Slower, as microwaves are longer
    • Faster, as microwaves are stronger
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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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