Consider the following statements:
(1) Caruso is said to have shattered a crystal chandelier with his voice. This is based on the principle of reverberation.
(2) If you repeatedly tap the side of a drinking glass with a spoon while filling it with water, you will notice that the pitch of the sound decreases.
Which of the given statements is/are correct?
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Only (1)
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Only (2)
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Both (1) and (2)
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Neither (1) nor (2)
B
Correct answer
Explanation
Statement (1) is wrong. The shattering of crystal chandelier is based on the principle of resonance of sound. A driving force in tune with the natural frequency (sometimes known as the resonant frequency) of an oscillator can buildup larger amplitudes than the oscillator could alone. This buildup is known as resonance or sympathetic vibration.
Statement (2) is correct. If you repeatedly tap the side of a drinking glass with a spoon while filling it with water, you will notice that the pitch of the sound decreases. The length of the medium to travel the sound increases with the addition of water in glass and hence decreases the pitch of sound.