Electromagnetic Waves
Odisha Board · Class 12 · Physics
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What is the speed of electromagnetic waves in vacuum?
Who predicted the existence of electromagnetic waves?
What is displacement current?
The relationship between electric and magnetic field amplitudes in an EM wave is:
Sample Questions
Which of the following are characteristics of electromagnetic waves?
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Electric and magnetic fields are perpendicular, They can travel through vacuum, All have the same speed in vacuum
Electromagnetic waves are transverse waves where E and B fields are perpendicular to each other and to the direction of propagation. They can travel through vacuum and all have speed c in vacuum.
Which type of electromagnetic wave has the longest wavelength?
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Radio waves
In the electromagnetic spectrum, radio waves have the longest wavelengths (from meters to kilometers), followed by microwaves, infrared, visible light, etc.
Gamma rays are produced by:
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Radioactive nuclei
Gamma rays are high-energy electromagnetic waves produced during radioactive decay of atomic nuclei and in nuclear reactions.
Which regions of the electromagnetic spectrum can be harmful to humans?
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Ultraviolet rays, X-rays, Gamma rays
High-energy electromagnetic waves like UV rays, X-rays, and gamma rays can damage living tissues. Visible light and radio waves are generally safe at normal intensities.
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