Electromagnetic waves: from radio to ultraviolet

Grade 8 Science Worksheet

Circle the best answer.

1. 1.

   Ari compares two invisible bands. Which has longer waves: infrared or ultraviolet?

   • Infrared
   • Ultraviolet
   • They are the same length
2. 2.

   An oven's microwaves are about 12 cm long. A TV remote's infrared is about 940 nm long. Which has the higher frequency, Esme?

   • The microwaves, as their waves are longer
   • Neither has a frequency
   • The infrared
   • Both, since both are invisible

3. Read this first

   Table (NASA examples)

   Band, example use. Radio waves, radio stations and radio telescopes; microwaves, microwave ovens and weather radar; infrared, TV remotes and thermal cameras; visible light, seeing and photos; ultraviolet, seen by bumblebees.

4. 3.

   Jun watches a weather report with a radar map of rain. Using the table, which band does weather radar use?

   • Sound waves bounced off clouds
   • Visible light
   • Microwaves
   • Ultraviolet
5. 4.

   Kira's thermal camera shows a sleepy dog glowing on the screen. Using the table, which band does a thermal camera sense?

   • Radio waves
   • Sound waves from the dog's snores
   • Ultraviolet
   • Infrared
6. 5.

   Luz reads that bumblebees can see a band people cannot. Using the table, which band is it?

   • Ultraviolet
   • Infrared
   • Radio waves
   • Microwaves
7. 6.

   At night, Noah's cat shows up brightly on a thermal camera. Why does the camera see the cat?

   • The warm cat gives off infrared
   • The camera picks up the cat's purring
   • The cat gives off visible light
   • The cat reflects radio waves
8. 7.

   Pia presses the TV remote but sees no beam. Why can't people see the remote's beam?

   • It is infrared, beyond the colors we see
   • It is ultraviolet, beyond violet
   • It is a beam of sound
   • It moves too fast to see
9. 8.

   Ren puts on sunscreen at the beach. Which kind of light from the Sun does sunscreen help block?

   • Ultraviolet
   • Infrared warmth
   • Radio waves
   • Visible light, so the Sun looks dim
10. 9.

    Ultraviolet waves are shorter than visible light. Tala marks ultraviolet on a blank strip. Where does it go?

    • Just past violet
    • Between radio waves and microwaves
    • Just past red
    • In the middle of visible light
11. 10.

    Zee reads that ozone high above Earth absorbs about 95% of one kind of the Sun's rays. Which kind?

    • Visible light
    • Infrared
    • Radio waves
    • UV-B ultraviolet