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A man is standing on a railway platform listening to the whistle of an engine that passes the man at constant speed without stopping. If the engine passes the man at time ${t_0}$. How does the frequency $f$ of the whistle as heard by the man changes with time
A fork of frequency $256\, Hz$ resonates with a closed organ pipe of length $25.4\, cm$. If the length of pipe be increased by $2\, mm$, the number of beats/sec. will be
A tuning fork of frequency $480\, Hz$ is used in an experiment for measuring speed of sound $(\nu )$ in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, ${\ell _1} = 30\,cm$ and ${\ell _2} = 70\,cm$. Then $\nu$ is equal to ..... $ms^{-1}$
The sound intensity level at a point $4 \,m$ from the point source is $10 \,dB$, then the sound level at a distance $2 \,m$ from the same source will be ........ $dB$
A source and an observer approach each other with same velocity $50 m/s$. If the apparent frequency is $435 \,s^{-1}$, then the real frequency is .... $s^{-1}$
An organ pipe filled with a gas at $27^{\circ}\,C$ resonates at $400\,Hz$ in its fundamental mode. If it is filled with the same gas at $90^{\circ}\,C$, the resonance frequency at the same mode will be $...........\,Hz$
A tuning fork and an air column whose temperature is $51^{\circ} C$ produce $4$ beats in one second, when sounded together. When the temperature of air column decreases the number of beats per second decreases. When the temperature remains $16^{\circ} C$ only one beat per second is produced. The frequency of the tuning fork is ........... $Hz$
The fundamental frequency of a closed pipe is $220 Hz$. If $\frac{1}{4}$ of the pipe is filled with water, the frequency of the first overtone of the pipe now is ..... $Hz$