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Question

Suppose that the electromagnetic wave in vacuum is
E={(3.1NC)cos[(1.8radm)y+(5.4×106rads)t]^i
What is the frequency?

A
8.6×105Hz
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B
4.3×105Hz
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C
8.6×103Hz
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D
4.3×103Hz
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Solution

The correct option is A 8.6×105Hz
Comparing the given equation with general form of wave equation
E=E0cos(kyωt)
we get
ω=5.4×106 rad/s
We know that frequency is given by
ν=ω2π
Putting value of ω and solving we get
ν=8.6×105 Hz


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