Electromagnetic waves: from radio to ultraviolet

Grade 8 Science Worksheet - Building Confidence

Circle the best answer.

1. 1.

   Spectrum strip, not to scale. Ari studies a spectrum strip on a poster. Which band has the longest waves?

   • Infrared
   • Ultraviolet
   • Visible light, the waves we see
   • Radio waves
2. 2.

   “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?

   • Ultraviolet
   • Infrared
   • Sound waves
   • Radio waves
3. 3.

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

   • Ultraviolet
   • Infrared
   • Sound waves
   • Radio waves from a tower
4. 4.

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

   • Visible light from the oven lamp
   • Sound waves from the oven's hum
   • Microwaves
   • Ultraviolet
5. 5.

   Milo spots a rainbow after the rain (and a very surprised pigeon). Which color has the longest wavelength?

   • Violet
   • Green
   • Red
6. 6.

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

   • Yellow
   • Violet
   • Red
7. 7.

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

   • Green, yellow, red, orange, blue, violet
   • Violet, blue, green, yellow, orange, red
   • Red, orange, yellow, green, blue, violet
   • Yellow, red, orange, green, violet, blue
8. 8.

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

   • Both arrive together
   • The radio waves, as they are bigger
   • The light, as its waves are shorter
   • Neither: space has no air to carry them
9. 9.

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

   • Yes: like sound, they need matter
   • Yes: sunlight rides on the solar wind
   • No, but they slow down in space
   • No: they can cross empty space
10. 10.

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

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