Assignment

From the following identify the electromagnetic waves having the
(i) Maximum frequency
(ii) Minimum frequency

Experimental observations have shown that $X$-rays travel in a vacuum with the speed of light. What conclusion can be drawn about $X$-rays from this observation?

Name the part of electromagnetic spectrum which is used
(i) in T.V. communication.
(ii) to maintain the warmth on earth.

Is displacement current a source of magnetic field?

(i) When $\gamma$-rays and $X$-rays have same energy, how can they be distinguished?
(ii) During charging of a capacitor the conduction current is $0.50 \mathrm{A}$. What is displacement current between the plates of the capacitor?

(i) What is the ratio of speed of UV rays and infrared rays in vacuum? What is harmful effect of UV rays?
(ii) Which part of electromagnetic spectrum has largest penetrating power? Write its, frequency range, and one use.

The magnetic field of a beam emerging from a filter kept in front of light source is given as $B=12\times {10}^{-8}\sin \left(1.20\times {10}^{7}y-3.6\times {10}^{15}t\right) \mathrm{T}$. What is the average intensity of the beam?

Find wavelength of electromagnetic waves of frequency $6\times {10}^{12} \mathrm{Hz}$ in vacuum. Give its three applications.