Electromagnetic waves: from radio to ultraviolet

Grade 8 Science Worksheet - Building Confidence

Circle the best answer.

1. 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. 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. 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. 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. 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. 6.

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

   • Violet
   • Red
   • Yellow
7. 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. 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. 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. 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