A) \[y=a\sin \,(\omega \,t+kx)\]
B) \[y=-a\sin \,(\omega \,t+kx)\]
C) \[y=a\sin \,(\omega \,t-kx)\]
D) \[y=-a\sin \,(\omega \,t-kx)\]
Correct Answer: B
Solution :
| [b] Equation of a wave |
 ... (i) |
| Let equations of another wave may be |
 ... (ii) |
 ... (iii) |
| If Eq. (i) propagates with Eq. (ii), then we get the resultant wave |
 ... (iv) |
| If Eq. (i) propagates with Eq. (iii), then we get |
. (v) |
After putting  in Eqs. (iv) and (v) respectively, we get |
 and  |
| Hence, Eq. (iii) is a equation of unknown wave. |
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