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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: - Which of the following rods of same material undergoes maximum elongation
- If in a L-R series circuit the power factor is 1/2 and R=100Ω, then the value of L is,
- Imagine a light planet revolving around a very massive star in a circular
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Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following rods of same material undergoes maximum elongation
- If in a L-R series circuit the power factor is 1/2 and R=100Ω, then the value of L is,
- Imagine a light planet revolving around a very massive star in a circular
- Two balls are dropped from same height at 1 second interval of time.
- An air bubble in a glass slab with refractive index 1.5 (near normal incidence)
Topics: Electromagnetic Waves (28)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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