(A): The frequencies of incident, reflected and refracted waves of sound propagating from one medium to another medium are same.
(R): The incident, reflected and refracted rays are coplanar.

Options

A. Both 'A' and 'R' are true and 'R' is the correct, explanation of 'A'.
B. Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
C. A' is true and 'R' is false
D. Both 'A' and 'R' are false

Answer

B