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PHYSICS

JAMB 2020 - Question 25

Physics 2020 JAMB Past Questions - Question 25: The diagram above represents a transverse electromagnetic wave travelling with speed 3.0 x 108ms-1. What is the frequency of the wave.

Use the diagram to answer question that follows

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 10^7Hz

B: 9.0 x 10^7Hz

C: 1.0 X 10^9Hz

D: 3.0 X 10^9Hz

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Correct Answer

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