Ncert Exercises & Solutions

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

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

Choose the correct options:

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.