Question

Electromagnetic waves are produced by oscillating accelerated particle. Give the reason, why electromagnetic waves have more application than the non-electromagnetic waves? An EM radiation coming out when a TV remote is switched on. Now, if it starts propagating from vacuum into water, it is assumed that its speed is reduced to half, predict its wavelength in water and justify your result. Compare and validate your results for a radiation coming out from an X-ray machine. Compare the effects on frequency of both EM waves when there is a change in medium. Justify your findings.

Answer 1

The electromagnetic waves have more applications than non-electromagnetic waves due to the following reasons

1. it travel with speed of light

2. It can travel long distance without losing much of its energy

3. it does not get affected due to  electric field and magnetic field

The speed of Electromagnetic waves traveling from vacuum into water assumed to be reduced to half.

Refractive index, n = c/v = c2/c = 2

Wavelength of radiation in water, λw = λ/n = λ/2

this implies that the wavelength of radiation in water is also reduced to half

the frequency of all the electromagnetic radiation depends on the source of waves and independent of medium through which it propagates. There is no effect on frequency of radiation when there is a change in medium