Question

Four independent waves are expressed as \[ (i)\; y_1=A_1\sin\omega t, \] \[ (ii)\; y_2=A_2\sin 2\omega t, \] \[ (iii)\; y_3=A_3\cos\omega t, \] \[ (iv)\; y_4=A_4\sin\left(\omega t+\frac{\pi}{3}\right) \] The interference between two of these waves is possible in

• A. (i) and (iii) only
• B. (iii) and (iv) only
• C. (i), (iii) and (iv) only
• D. All of them

Hint:

For interference, remember the keyword: \[ \boxed{\text{Same frequency + Constant phase difference}} \] Different frequencies do not produce sustained interference.

Answer 1

The Correct Option is C