Name: ______________________________ period:
SPEED OF LIGHT MATH
C = λf
and
d= ct
Equations:
Units: c: m/s
Frequency: Hz (1/s)
Speed of Light [and all Electromagnetic Spectrum Waves] (c) = 3.0 x 108 m/s
Wavelength (λ): meters
PROBLEMS: SHOW YOUR WORK AND LABEL YOUR ANSWERS!
1.
Violet light has a wavelength of 4.10 x 10-12 m. What is the frequency?
2. Green light has a frequency of 6.01 x 1014 Hz. What is the wavelength?
3. Calculate the wavelength of radiation with a frequency of 8.0 x 1014 Hz.
4. What is the wavelength of light with a frequency of 7.66 x 1014 Hz?
5. A helium laser emits light with a wavelength of 633 nm. What is the frequency of the light?
[Hint: First, convert nanometers(nm) into meters by multiplying by 109]
6. What is the wavelength of X-rays having a frequency of 4.80 x 1017 Hz?
7. How long did it take Pioneer 10's radio signals, traveling at the speed of light, take to reach Earth from
the distance of Pluto in April 1983, a distance of 4.58 x 1012 m ? Express your answer in hours.
8. If it takes 1.33 seconds for radio waves (which travel at the speed of light) to reach the moon from
Earth, how far away is the moon?