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DH 52 – Energy and Electromagnetic Waves
Read in your text book pages 521 – 527
1. T
F There is only one type of energy.
2. T
F Energy can disappear from the universe.
3. T
F
4. T
F When we say that energy is conserved, we mean that the energy of each object stays
constant.
5. T
F The sun sends energy to the earth via electromagnetic radiation. Therefore, the sun must be
decreasing in energy.
If the kinetic energy of an object decreases, the lost energy must show up somewhere else,
or in some other form.
6. Name five different forms that energy can take. (Try to do this without looking at your notes.)
7. Name the colors in the visible part of the spectrum in order of decreasing wavelength.
8. Name the colors in the visible part of the spectrum in order of increasing wavelength.
9. Consider two light waves traveling in air. If light wave 1 has a longer wavelength than light wave 2,
which light wave has the higher frequency? Explain, using an equation.
Choose the correct word in for the following statements.
10. Blue light has a ___________________________(longer or shorter) wavelength than red light.
11. Yellow light has a ________________________(higher or lower) frequency than blue light.
12. If “light A” has a longer wavelength than “light B”, then “light A” has _______________ “light B”.
A. a lower frequency than
B. a higher frequency than
C. the same frequency as
13. If “light E” has a higher frequency than “light F”, then “light E” has ________________ “light F”.
A. a longer wavelength than
B. a shorter wavelength than
C. the same wavelength as
14. Name the colors in the visible part of the spectrum in order of increasing frequency.
15. Name the colors in the visible part of the spectrum in order of decreasing frequency.
16. Why do some objects appear black?
17. Which of the following statements is true?
A. The frequency of green light is higher than the frequency of blue light and the wavelength of
green light is longer than the wavelength of blue light.
B. The frequency of green light is higher than the frequency of blue light and the wavelength of
green light is shorter than the wavelength of blue light.
C. The frequency of green light is lower than the frequency of blue light and the wavelength of
green light is shorter than the wavelength of blue light.
D. The frequency of green light is lower than the frequency of blue light and the wavelength of
green light is longer than the wavelength of blue light.
E. The frequency of green light is the same as the frequency of blue light and the wavelength of
green light is shorter than the wavelength of blue light.
18. What has to move back and forth in order to create an electromagnetic wave?
19. What can you place in a given position in order to find out if there is an electromagnetic wave
passing through that position?
20. Calculate the frequency of visible light that has a wavelength of 551 nm. The wave is traveling in
air.
21. A certain radio station broadcasts electromagnetic radiation with a wavelength of one-quarter mile
(0.25 mi). What is the frequency of the broadcast? The wave is traveling in air.