Electromagnetic waves: from radio to ultraviolet

Grade 8 Science Worksheet - Challenge Me

Circle the best answer.

1. 1.

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

   • Radio, microwaves, ultraviolet, visible, infrared
   • Microwaves, radio, infrared, visible, ultraviolet
   • Ultraviolet, visible, infrared, microwaves, radio
   • Radio, microwaves, infrared, visible, ultraviolet
2. 2.

   Esme has four wavelengths: 300 nm, 940 nm, 500 nm and 12 cm. Visible light runs from about 380 to 700 nm. Which one is ultraviolet?

   • 500 nm
   • 940 nm
   • 300 nm
   • 12 cm
3. 3.

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

   • Radio waves
   • Ultraviolet, as its frequency is lowest
   • Ultraviolet, as its waves are shortest
   • Visible light
4. 4.

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

   • Agree: radio travels the farthest
   • Disagree: radio carries the least here
   • Disagree: radio waves carry no energy
   • Agree: longer waves hold more energy
5. 5.

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

   • Disagree: radio waves are faster than light
   • Disagree: they travel at the speed of light
   • Agree: radio waves need air to speed up
   • Agree: long waves move slowly
6. 6.

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

   • Agree: light fades without air
   • Disagree: sound needs no air either
   • Agree: waves need a medium
   • Disagree: light can cross empty space
7. 7.

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

   • Disagree: ultraviolet cannot cross space
   • Disagree: both go at the speed of light
   • Agree: shorter waves move faster
   • Agree: ultraviolet has more energy, so more speed
8. 8.

   The Moon is about 384,400 km away, so its light takes about 1.3 s to reach Earth. How long does a radio signal from a Moon lander take, Ren?

   • About 1.3 minutes
   • It cannot arrive: there is no air
   • About 1.3 s
   • Much longer, as radio waves are slower
9. 9.

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

   • Neither: signals need air
   • They arrive together
   • The laser light, as its waves are shorter
   • The radio, as it is stronger
10. 10.

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

    • They don't: visible light is faster
    • Ultraviolet waited for the light
    • Air slowed the faster one down
    • They share one speed in space