Ncert Exercises & Solutions

A charged particle oscillates about its mean equilibrium position with a frequency of $10^{9} Hz$ . The electromagnetic waves produced:

(a) will have frequency of $10^{9} Hz$
(b) will have frequency of $2 \times 10^{9} Hz$
(c) will have wavelength of 0.3 m
(d) fall in the region of radiowaves

Choose the correct option

1. (a, b, c)

2. (a, c, d)

3. (b, c, d)

4. (c, d)

(2) Hint: The electromagnetic wave will have the same frequency as that of the oscillating particle.

Step 1: Find the wavelength of the wave.

Given, the frequency by which the charged particle oscillates about its mean equilibrium position =

10^{9}

So, the frequency of electromagnetic waves produced by the charged particle is

ν

10^{9}

Wavelength, λ = \frac{c}{v} = \frac{3 \times 10^{8}}{10^{9}} = 0.3 m

Also, the frequency of

10^{9}

Hz fall in the region of radio waves.

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