Physics-EM Spectrum
NEET Physics EM Spectrum MCQ Question
Type: MCQ-numerical-Hard-Class 12
If a plane electromagnetic wave travels in vacuum with a frequency of 30 MHz, what is its wavelength?
A
10 m
B
20 m
C
30 m
D
40 m
Correct Answer
Option A
Detailed Explanation
The speed of electromagnetic waves in vacuum is the speed of light, c = 3 x 10^8 m/s. Using the formula wavelength = speed/frequency, the wavelength is (3 x 10^8 m/s) / (30 x 10^6 Hz) = 10 meters.
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