NEET Physics EM Spectrum MCQ Question
If a plane electromagnetic wave travels in vacuum with a frequency of 30 MHz, what is its wavelength?
10 m
20 m
30 m
40 m
Correct Answer
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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