Question

Ratio of intensities of two coherent waves are given by 4:1. The amplitudes of the two waves is:

• A. 2:1
• B. 1:2
• C. 4:1
• D. 1:4

Answer 1

The correct option is A 2:1

Intensity ratio is given by 4/1
Amplitudes of the two waves are simply the square root of the intensities.
Thus Amplitude ratio is given by $\sqrt{\frac{4}{1}}$
$=2/1$