Embibe Experts Solutions for Chapter: Electromagnetic Waves, Exercise 6: Exercise (Assertion & Reason)

Assertion :- Electromagnetic radiations exert pressure.
Reason :- EM-waves carry both momentum & energy.

Assertion :- Sound waves cannot travel in vacuum but light waves can travel in vacuum.
Reason :- Sound waves are longitudinal waves and they cannot be polarised but electromagnetic waves are transverse and they can be polarised.

Assertion :- Environment damage has increased the amount of ozone in the atmosphere.
Reason :- Increase ozone increases amount of UV radiation on Earth.

Assertion :- The microwaves are better carriers of signals than radio waves.
Reason :- The electromagnetic waves do not require any medium for propagation.

Assertion :- The average magnitude of Poynting vectors $\overrightarrow{S}$ is the intensity of electromagnetic wave.

Reason :- The Poynting vector is given by $\overrightarrow{S}=\frac{\overrightarrow{E}\times \overrightarrow{B}}{2{\mu }_0}$. 

Assertion :- Displacement current is a fictitious current and has nothing in common with the conduction current.
Reason :- It was proposed by Maxwell only to satisfy Kirchhoff’s junction rule.

Assertion : EM wave follow superposition principle.
Reason : Differential expression of EM wave is linear.

Assertion :- The gyrating electron can be a source of EMW.
Reason :- The electron in circular motion is accelerated motion.