Light & Energy WS
1. The red light from a helium-neon laser has a wavelength of 633 nm . What is the energy of one
photon?
2. The red light from a helium-neon laser has a frequency of 4.74 x 10 14 Hz. What is the energy of
one photon?
3. What is the energy of a photon whose frequency is 3.0 X 1012 Hz?
4. Calculate the frequency for a  = 700 nm
Calculate the frequency for a  = 400 nm
Calculate the energy for each wavelength.
Which wavelength has the greatest frequency? Which wavelength has more energy?
5. A red light has a wavelength of 728 nm.
What is the frequency of the light?
What is the speed of the wave in m/s?
6. A purple light has a frequency of 7.42 x 1014 Hz.
What is its wavelength?
What is the energy of one quanta of light?
7. You broke your big toe! The x ray they take of toes uses waves that have a length 2.19 x 1010m.
What is the speed of the wave in m/s?
What is the wavelength in nm?
What is the frequency of the x ray?
8. The yellow light given off by a sodium vapor lamp used for public lighting has a wavelength of
589 nm. What is the frequency of this radiation?
9. A certain microwave has a wavelength of 0.032 meters. Calculate the frequency of this
microwave.
10. A radio station broadcasts at a frequency of 590 KHz. What is the wavelength of the radio
waves?
11. Microwave ovens emit microwave energy with a wavelength of 12.9 cm. What is the energy of
exactly one photon of this microwave radiation?
12. Calculate the energy of one photon of yellow light that has a wavelength of 589nm.
13. A laser emits light of frequency 4.74 x 1014 sec -1. What is the wavelength of the light in nm?
14. A certain electromagnetic wave has a wavelength of 625 nm. What is the frequency of the
wave?
15. How many minutes would it take a radio wave to travel from the planet Venus to Earth?
(Average distance from Venus to Earth = 28 million miles)
16. The blue color of the sky results from the scattering of sunlight by air molecules. The blue light
has a frequency of about 7.5 x 1014 Hz
a. a.)Calculate the wavelength, in nm, associated with this radiation.
b. b.) Calculate the energy, in joules, of a single photon associated with this frequency.
17. The retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 1017J. For light of 600 nm wavelength, how many photons does this correspond to?