NEET Physics EM Spectrum MCQ Question with Solution

If a plane electromagnetic wave has a frequency of 30 MHz, what is its wavelength in vacuum?

A

10 m

B

20 m

C

30 m

D

40 m

Correct Answer

Option A

Detailed Explanation

The relation between frequency $u$ and wavelength $\lambda$ is given by $u\lambda = c$ . For $u = 30 \text{ MHz}$ , $\lambda = c / 30 \times 10^6 \text{ Hz}$ . Since $c = 3 \times 10^8 \text{ m/s}$ , $\lambda = 10 \text{ m}$ .

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