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The diagram above represents a transverse elect... - JAMB Physics 1999 Question

The diagram above represents a transverse electromagnetic wave travelling with speed 3.0 x 108ms-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 option: d

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 108) / 0.1

= 3.0 x 109Hz

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