Unit: Waves
Year: 1990 Question#: 45
Question: In a vacuum the wavelength of green light is 5 x 10-7 meter. What is the frequency?
(1 ) 2 x 10-15 Hz
(2 ) 2 x 10-14 Hz
(3 ) 6 x 1014 Hz
(4 ) 6 x 1015 Hz
What is this question really asking?
Explanation by: Derek N
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Answer 1
2 x 10-15 Hz
INCORRECT
If you guessed this you are wrong. This is not a possible answer. Try using the formula
where v is the speed of light (c = 3.0 x 108 m/s).
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Answer 2
2 x 10-14 Hz
INCORRECT
You must have divided the wavelength by the velocity instead of velocity by wavelength.
Try using the formula
where v is the speed of light (c = 3.0 x 108 m/s).
return to top Answer 3
6 x 1014 Hz
CORRECT
The velocity of light in a vacuum is 3 x 108m/s you can find this value in the reference table. When this number is divided
by the wavelength you get a frequency of 6 x 1014 Hz.
return to top Answer 4
6 x 1014 Hz
INCORRECT
Try again, this is not a possible answer. Try using the formula
where v is the speed of light (c = 3.0 x 108 m/s).
return to top What's this question really asking?
What is the frequency of green light in a vacuum if the wavelength is 5 x 10-7 meter? return to top
