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 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

waec 1989 physics

The correct answer is D. 300

Î» = 2 x 50 = 100cm = 1m.

V = fÎ», f = v/Î» = 300.

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