Question

Two light waves of equal amplitude and equal wavelengths are superimposed. The amplitude of the resultant wave will be maximum when phase difference between them is

• A. zero
• B. \(\frac{\pi}{4}\)
• C. \(\frac{\pi}{2}\)
• D. \(\pi\)

Hint:

Constructive interference (maximum amplitude) occurs when the phase difference between two waves is zero.

Answer 1

The Correct Option is A

Step 1: Understanding the superposition principle.
When two waves of equal amplitude and wavelength superimpose, the resultant amplitude is determined by the phase difference between the waves.
Step 2: Amplitude and phase difference.
The amplitude of the resultant wave will be maximum when the two waves are in phase, i.e., when the phase difference between them is zero. This results in constructive interference.
Step 3: Conclusion.
Thus, the amplitude will be maximum when the phase difference is zero.
\[ \boxed{\text{Correct Answer: Zero}} \]