Physics
A singer can shatter a glass by singing at a particular pitch. The correct reason for the same is :
- The speed of sound is more in glass than in air.
- Glass absorbs the sound waves.
- The frequency of the singer's voice matches the natural frequency of the glass, causing resonance.
- None of the above.
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Answer
The frequency of the singer's voice matches the natural frequency of the glass, causing resonance.
Reason — A singer can shatter a glass when the frequency of the sound produced matches the natural frequency of the glass, a phenomenon known as resonance.
At resonance, the glass begins to vibrate with large amplitude and if these vibrations become strong enough, they exceed the elastic limit of the glass, causing it to break.
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Related Questions
The sound box of a musical instrument is so constructed that the air column inside it has a natural frequency …………… that of the string stretched in it.
- greater than
- smaller than
- equal to
- cannot say
Column X shows the kind of vibrations and column Y shows their examples.
X Y (A) Natural vibrations (1) A tuning fork when stroked on a rubber pad. (B) Damped vibrations (2) When a guitarist plucks or strums the guitar strings with his/her fingers. (C) Forced vibrations (3) When a troop crosses a suspension bridge. (D) Resonant vibrations (4) A load suspended from a spring. Choose the correct pairing:
(a) A—(4) B—(2) C—(3) D—(1)
(b) A—(4) B—(1) C—(2) D—(3)
(C) A—(4) B—(3) C—(1) D—(2)
(d) A—(2) B—(3) C—(4) D—(1)
(a) Name one factor on which the frequency of sound emitted due to vibration in an air column depends.
(b) How does the frequency depend on the factor stated in part (a)?
State one way of increasing the frequency of a note produced by an air column.