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
5. 4.

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

   • 650 nm, red
   • 550 nm, green
   • 450 nm, blue
6. 5.

   On the ladder, which photon carries more energy, Kira?

   Use the picture in question 4.

   • They are equal
   • The red one
   • The blue one
7. 6.

   What is a wave's wavelength, Milo?

   • The waves passing each second
   • The distance from crest to crest
   • The wave's height
8. 7.

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

   • It goes down
   • It stays the same
   • It goes up
9. 8.

   Which kind of light has the longest wavelength, Ren?

   • Visible light
   • Gamma rays
   • Radio waves
10. 9.

    Where does ultraviolet sit compared with visible light, Tala?

    • Between red and green
    • Longer waves than red
    • Shorter waves than violet
11. 10.

    Where does infrared sit compared with visible light, Zee?

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