Embibe Experts Solutions for Chapter: Electromagnetic Waves, Exercise 1: cbse-2018

Prove that the average energy density of the oscillating electric field is equal to that of the oscillating magnetic field.

Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.

Name the electromagnetic radiations used for eye surgery.

Which mode of propagation is used by short wave broadcast services ?

Why are infra-red waves often called heat waves ? Explain.

 What do you understand by the statement, “Electromagnetic waves transport momentum”?

Identify the part of the electromagnetic spectrum used in $\left(\mathrm{i}\right)$ radar and $\left(\mathrm{ii}\right)$ eye surgery. Write their frequency range.

Write an expression for the speed of light in a material medium of relative permittivity ${\epsilon }_r$ and relative magnetic permeability ${\mu }_r$