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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: - The conducting loop in the form of a circle is placed in a uniform magneitc field
- In which case positive work has to be done in seperating them?
- Stress to strain ratio is equivalent to
- When npn transistor is used as an amplifier
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Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The conducting loop in the form of a circle is placed in a uniform magneitc field
- In which case positive work has to be done in seperating them?
- Stress to strain ratio is equivalent to
- When npn transistor is used as an amplifier
- One way in which the operation of a n-p-n transistor differs from that of a p-n-p
Topics: Electromagnetic Waves (28)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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