CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

An electromagnetic wave of frequency 3 MHz passes from vacuum into a dielectric medium with relative permittivity εr=4 and relative permeability μr=1, then

A
the wavelength and frequency both remain unchanged.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
the wavelength is doubled and the frequency remains unchanged
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
the wavelength is doubled and the frequency becomes half.
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
the wavelength is halved and the frequency remains unchanged.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D the wavelength is halved and the frequency remains unchanged.
Frequency will always be independent of medium.
Here also frequency remains unchanged.

now,
μ(refractive index)=cv =1/ε0μ01/εμ =εrμr

Since, μr is very close to 1, then
μ(refractive index)=εr

and given, εr=4
μ(refractive index)=4=2

Variation of wavelength with medium is given by
λmedium=λvaccumμ(refractive index) =λ2
Hence, correct answer is option (d).

flag
Suggest Corrections
thumbs-up
5
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Surfing a Wave
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon