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951

A sound wave of velocity 350 ms^-1 is directed towards the surface of water. lf the ratio of the wavelength of sound in water to that in air is 425:100, calculate the velocity on the wave in water

A. 82.4ms^-1
B. 148.8ms^-1
C. 350.0ms^-1
D. 1487.5ms^-1
E. 3500.5ms^-1.

View Answer & Discuss (3) WAEC 1996

952

The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)

A. 1320m
B. 165m
C. 600m
D. 330m
E. 343m

View Answer & Discuss (9) WAEC 1996

953

The diagram above illustrates a variation of the displacement y of a wave particle with time t. lf the velocity of wave is 250ms-1, calculate the distance between two successive particles which are in phase

A. 20m
B. 2.5m
C. 3.0m
D. 5.0m
E. 50.0m

View Answer & Discuss (12) WAEC 1996

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954

The diagram above represents a stationary wave set up in a string which is fixed at both ends. lf the frequency of the wave is 256Hz and the distance N1 N2 equals 1.5m, calculate the speed of the wave.