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Question

The frequency of electromagnetic wave having wavelength 25mm is ____________ Hz


A

1·2×1010

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B

7·5×105

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C

1·2×108

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D

7·5×106

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Solution

The correct option is A

1·2×1010


Step 1: Given data

The wavelength of electromagnetic wave

λ=25mmλ=251000λ=25×10-3m

Step 2: Formula used

The frequency can be computed using the following formula:

f=cλ, where f=frequency, λ=wavelength, and c=3×108 speed of light.

Step 3: Compute the frequency

Substitute the known values in the formula f=cλ,

f=3·0×10825×10-3f=1·2×1010Hz

So, the frequency of electromagnetic waves will be1·2×1010Hz.

Hence, option A is the correct answer.


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