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QNEET-2013-Ph-1585: NEET 2013 Physics - Class 12 NEET-2013-Ph-1585 Solution: An electromagnetic wave of frequency \( = 3.0\ {MHz}\) passes…
An electromagnetic wave of frequency passes from vacuum into a dielectric medium with relative permittivity . Then Wavelength is doubled and frequency becomes half. Wavelength is halved and frequency remains unchanged. Wavelength and frequency both remain unchanged. Wavelength is doubled and frequency unchanged.
Multiple Choice Options
- A Wavelength is doubled and frequency becomes half.
- B Wavelength is halved and frequency remains unchanged.
- C Wavelength and frequency both remain unchanged.
- D Wavelength is doubled and frequency unchanged.
Step-by-Step Verified Solution
Velocity of electromagnetic wave in vacuum
c = 1 _ 0 _ 0 = _ _ vacuum .....(1)
Velocity of electromagnetic wave in the medium
v medium = 1 _ 0 _ r _ 0 _ r = c _ r _ r
For dielectric medium, _ r = 1
_ v medium = c _ r = c 4 = c 2 ........(2)
Wavelength of the wave in medium
_ medium = v m e d i u m _ = c 2 _ = _ v a c c u m 2