A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s.

A. 3
B. 6
C. 150
D. 300
E. 600

Correct Answer:

Option D = 300

Explanation

λ = 2 x 50 = 100cm = 1m.
V = fλ, f = v/λ = 300.