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## MCQ (More than One Correct Answer)

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The intensity of a sound appears to an observer to be periodic. Which of the following can be the cause of it?
WB JEE 2018

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A car moving with a velocity of 36 km/hr crosses a siren of frequency 500 Hz. The apparent frequency of siren after pass...
WB JEE 2008
Two turning forks of frequencies n1 and n2 produces n beats per second. If n2 and n are known, n1 may be given by...
WB JEE 2008
When sound is produced in an aeroplane with a velocity of 200 m/s horizontally its echo is heard after $$10\sqrt 5$$ se...
WB JEE 2008
Two stretched strings have lengths l and 2l while tensions are T and 4T respectively. If they are made of same material ...
WB JEE 2008
A hollow cylinder with both sides open generates a frequency f in air. When the cylinder vertically immersed into water ...
WB JEE 2008
The equation of a progressive wave can be given by $$y = 15\sin (660\pi t - 0.02\pi x)$$ cm. The frequency of the wave i...
WB JEE 2008

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