JEE Main & Advanced
Physics
Wave Mechanics
Question Bank
Progressive Waves
question_answer
Equation of the progressive wave is given by : \[y=a\sin \pi (40t-x)\] where \[a\] and \[x\] are in metre and \[t\] in second. The velocity of the wave is [KCET 1999]
A) 80 m/s
B) 10 m/s
C) 40 m/s
D) 20 m/s
Correct Answer:
C
Solution :
\[v=\frac{\text{Co-efficient of }t}{\text{Co-efficient of }x}=\frac{40}{1}=40\,m/s\]