Sound waves in air are
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- 1The pressure wave, $P = 0.01\,sin\,[1000t -3x]\,Nm^{-2},$ corresponds to the sound produced by a vibrating blade on a day when atmospheric temperature is $0\,^oC.$ On some other day when temperature is $T,$ the speed of sound produced by the same blade and at the same frequency is found to be $336 \,ms^{-1}$. Approximate value of $T$ is .... $^oC$View Solution
- 2The diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right.View Solution
Which one of the following correctly shows the direction of the velocity of the points $1, 2$ and $3$ on the string
- 3The intensity of sound wave while passing through an elastic medium falls down by $10\%$ as it covers one metre distance through the medium. If the initial intensity of the sound wave was $100$ decibels, its value after it has passed through $3$ metre thickness of the medium will be .... $decibel$View Solution
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$Reason :$ Wavelength is the distance between two nearest particles in phase. - 7A person blows into open-end of a long pipe. As a result, a high-pressure pulse of air travels down the pipe. When this pulse reaches the other end of the pipe.View Solution
$(A)$ a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is open.
$(B)$ a low-pressure pulse starts traveling up the pipe, if the other end of the pipe is open.
$(C)$ a low-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.
$(D)$ a high-pressure pulse starts traveling up the pipe, if the other end of the pipe is closed.
- 8If the length of a closed organ pipe is $1m $ and velocity of sound is $330 m/s$, then the frequency for the second note isView Solution
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