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An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity ε = 4.0. Then
Options
(a) wavelength is doubled and frequency is unchanged
(b) wavelength is doubled and frequency becomes half
(c) wavelength is halved and frequency remains unchanged
(d) wavelength and frequency both remain unchanged
Correct Answer:
wavelength is halved and frequency remains unchanged
Explanation:
Given : frequency f = 2 MHz, relative permitivity εᵣ = 4
For formula,
velocity v = c / √εᵣ = c / 2
λ’ = λ / 2
[since frequency remains unchanged ]
Related Questions: - An air core coil and an electric bulb are connected in series with an AC source.
- The earth is assumed to be a sphere of radius R. A platform is arranged at a height R
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Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An air core coil and an electric bulb are connected in series with an AC source.
- The earth is assumed to be a sphere of radius R. A platform is arranged at a height R
- Which of the following rods of same material undergoes maximum elongation
- If seperation between screen and source is increased by 2%. What would be the effect
- A charge Q is enclosed by a Gaussian spherical surface of radius R
Topics: Electromagnetic Waves (28)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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