| ⇦ | 
| ⇨ |
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 alternating emf given by equation
e=300 sin[(100 π)t] V
- Ice is wrapped in black and white cloth. In which cases more ice will melt
- A vibrating string of certain length l under a tension T resonates with a mode
- When a wire of uniform cross-section a, length l and resistance R
- Two concentric spheres kept in air have radii R and r.
Topics: Electromagnetic Waves
(28)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An alternating emf given by equation e=300 sin[(100 π)t] V
- Ice is wrapped in black and white cloth. In which cases more ice will melt
- A vibrating string of certain length l under a tension T resonates with a mode
- When a wire of uniform cross-section a, length l and resistance R
- Two concentric spheres kept in air have radii R and r.
Topics: Electromagnetic Waves (28)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply