Sometimes, the glasses of the windows of a house are found to
be shattered when large sounding bodies like aeroplane pass near the
hose. Explain how?
Ans: Every substance has its natural frequency of
oscillation when it is set into vibrations, including glass. When the
sound produced by anything match this frequency, the amplitude of
vibration of glass will be very high, which brings shear to them. When
the amount of shearing force exceeds the breaking force, they crack.
Sometimes the explosions can be such that the frequency of their
sound matches this natural frequency, causing large scale vibration, at
least for some time. This cracks them.
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