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Question

An electric charge oscillating with a frequency of 1kilocycles/s can radiate electromagnetic waves of wavelength.


A

100km

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B

200km

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C

300km

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D

400km

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Solution

The correct option is C

300km


Step1. Given data:

Frequency of the electromagnetic wave f=1kilocycles/s=1x103cycles/s=103Hz

Velocity of the electromagnetic wave is c=3×108m/s

Step2. Find the wavelength of electromagnetic wave:

λ=velocity/frequency

=c/f=(3x108)/103

=3x105m=300km

Hence, option (C) is correct.


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