Physics
JAMB 1999
The diagram above represents a transverse electromagnetic wave travelling with speed 3.0 x 10
8ms
-1. What is the frequency of the wave.
-
A.
3.0 x 107Hz
-
B.
9.0 x 107Hz
-
C.
1.0 x 109Hz
-
D.
3.0 x 109Hz
Correct Answer: Option D
Explanation
The frequency f =
V/
λ,
Where λ = wavelength
From the above, the distance OA = one wavelength; AB = one wave length and BC = one wavelength.
=> OC = 3 wavelength = 3λ
∴3λ = 0.3M
λ =
0.3/
3
= 0.1m
∴ f =
V/
λ = (3.0 x 10
8) / 0.1
= 3.0 x 10
9Hz
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