Light: wavelength, frequency and energy

Answer Key - Grade 10 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Using c = λν with c = 3.00 × 10⁸ m/s, what is the frequency of 400 nm light, in units of 10¹⁴ Hz, Ari?

   7.5 × 10¹⁴ Hz
2. 2.

   Using c = λν with c = 3.00 × 10⁸ m/s, what is the frequency of 500 nm light, in units of 10¹⁴ Hz, Bo?

   6 × 10¹⁴ Hz
3. 3.

   Using c = λν with c = 3.00 × 10⁸ m/s, what is the frequency of 600 nm light, in units of 10¹⁴ Hz, Esme?

   5 × 10¹⁴ Hz
4. 4.

   On the strip, which mark has the shortest wavelength, Jun?

   • 650 nm, red
   • 450 nm, blue
   • 550 nm, green
5. 5.

   What is a wave's wavelength, Milo?

   • The distance from crest to crest
   • The wave's height
   • The waves passing each second
6. 6.

   What does frequency measure, Noah?

   • Distance from crest to crest
   • How bright the light is
   • Waves passing each second
7. 7.

   If a light wave's wavelength gets longer, what happens to its frequency, Pia?

   • It goes down
   • It goes up
   • It stays the same
8. 8.

   Which kind of light has the longest wavelength, Ren?

   • Visible light
   • Radio waves
   • Gamma rays
9. 9.

   Where does ultraviolet sit compared with visible light, Tala?

   • Longer waves than red
   • Between red and green
   • Shorter waves than violet
10. 10.

    Where does infrared sit compared with visible light, Zee?

    • In the middle of the colors
    • Longer waves than red
    • Shorter waves than violet