NEET Electromagnetic Waves — Set 15

Question 1

What is the general form of the magnetic field component of a plane electromagnetic wave propagating along the $ z $-direction?

Accepted Answer

The document provides the form $ B_y = B_0 \sin(kz - \omega t) $, where $ B_y $ is along the $ y $-axis for a wave propagating along the $ z $-direction.

Question 2

An electromagnetic wave in vacuum has a wavelength of $ 4 \, \text{m} $. What is its frequency? (Given $ c = 3 \times 10^8 \, \text{m/s} $)

Accepted Answer

Using $ v \lambda = c $, we have $ v = \frac{c}{\lambda} = \frac{3 \times 10^8}{4} = 7.5 \times 10^7 \, \text{Hz} $.

Question 3

The amplitude of the electric field in an electromagnetic wave is $ E_0 = 120 \, \text{V/m} $. What is the amplitude of the magnetic field? (Given $ c = 3 \times 10^8 \, \text{m/s} $)

Accepted Answer

Using $ B_0 = \frac{E_0}{c} $, we have $ B_0 = \frac{120}{3 \times 10^8} = 4 \times 10^{-7} \, \text{T} $.

NEET Physics: Electromagnetic Waves — Practice Set 15

Q1. What is the general form of the magnetic field component of a plane electromagnetic wave propagating along the \( z \)-direction?

Q2. An electromagnetic wave in vacuum has a wavelength of \( 4 \, \text{m} \). What is its frequency? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

Q3. The amplitude of the electric field in an electromagnetic wave is \( E_0 = 120 \, \text{V/m} \). What is the amplitude of the magnetic field? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

Q4. An electromagnetic wave has a wave number \( k = 5 \, \text{rad/m} \). What is its wavelength in vacuum?

Q5. What property of visible light enables the human eye to differentiate colors?

Q6. Which type of electromagnetic waves are produced by bombarding a metal target with high-energy electrons?

Q7. What makes electromagnetic waves capable of carrying energy from one place to another?

Q8. Which type of electromagnetic waves are used in aircraft navigation radar systems?

Q9. What is the nature of the electric and magnetic fields in an electromagnetic wave?

Q10. What is the frequency of an electromagnetic wave with wavelength \( \lambda = 2 \, \text{cm} \) in vacuum? (Given \( c = 3 \times 10^8 \, \text{m/s} \))