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12th Standard English Medium Physics Subject Electromagnetic Waves Book Back 2 Mark Questions with Solution Part - I

Published on: 01/06/2021

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Std: 12th Standard - Physics

chapter: - Book back Questions

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Questions:

Generic 2

5 x 2 = 10

What is meant by Fraunhofer lines?

Explain the concept of intensity of electromagnetic waves.

Write down the integral form of modified Ampere’s circuital law.

What are electromagnetic waves?

What is displacement current?

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Answers Key:

Generic 2

5 x 2 = 10

When the spectrum obtained from the Sun is examined, it consists of large number of dark lines (line absorption spectrum). These dark lines in the solar spectrum are known as Fraunhofer lines.

The energy crossing per unit area per unit time and perpendicular to the direction of propagation of the electromagnetic wave is called the intensity.
Intensity, I = [u] c or \(I=\frac { total\ electromagnetic\ energy(U) }{ Surface\ area(A)\times time(t) } \)
\(=\frac { Power(P) }{ Surfacearea(A) } \)

\(\oint _l\vec{B} \cdot \overrightarrow{d l}=\mu_{o} i_{\text {c }}+\mu_{o} \varepsilon_{o} \frac{d}{d t} \oint _s \vec{E} \cdot \overrightarrow{d A}\)

An electromagnetic waves are the waves that are radiated by an accelerated charge which propagates through space as coupled electric and magnetic fields, oscillating perpendicular to each other and to the direction of propagation of the wave.

The displacement current can be defined as the current which comes into play in the region in which the electric field or the electric flux is changing with time.