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2376

A girl stand 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms^-1, how long would it take for her to hear the echo of the sound?

A. 2.062s
B. 0.970s
C. 0.485s
D. 0.242s

View Answer & Discuss (2) WAEC 2004

2377

Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To

A. increase the intensity of sound waves
B. increases the loudness of the sound waves
C. reduce the effect of revibration of sound waves
D. decreases thr frequency of sound waves

View Answer & Discuss WAEC 2004

2378

The sound from a vibrating tuning sound is when the tip of its stem is placed on a wooden table than when in air because

A. the friction between the table and the tuning fork generates additional energy
B. air molecules obsorb sound wave but wood transmit sound waves
C. the table increases the frequency of the turning fork
D. a large mass of air is set into vibration by the table

View Answer & Discuss (2) WAEC 2004

2379

Charges on a conductor are