WAEC - Physics (1989 - No. 28)
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.
3
6
150
300
600
توضيح
λ = 2 x 50 = 100cm = 1m.
V = fλ, f = v/λ = 300.
V = fλ, f = v/λ = 300.