Question

An observer standing at the sea coast observes 54 waves reaching the coast per minute. If the wavelength of the wave is 10 m, the velocity of the wave is

• A. 19 m/sec
• B. 29 m/sec
• C. 9 m/sec
• D. 39 m/sec

Answer 1

The correct option is C 9 m/sec

Total number of waves=$54$

wavelength of each wave=$10$

Total wavelength=$540m$

Time taken=$60$sec

velocity $=\frac{\lambda }{T}=\frac{540}{60}=9m/s$

Hence option (C) is correct