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A source of sound of frequency $450$ cycles/sec is moving towards a stationary observer with $34\, m/sec$ speed. If the speed of sound is $340\, m/sec,$ then the apparent frequency will be ..... $cycles/sec$
A sine wave has an amplitude $A$ and wavelength $\lambda$. Let $V$ be the wave velocity and $v$ be the maximum velocity of a particle in the medium. Then
A tuning fork gives $4$ beats with $50\, cm$ length of a sonometer wire if the length of the wire is shortened by $1\, cm$. the no. of beats still the same. The frequency of the fork is -............. $\mathrm{Hz}$
A whistle of frequency $500 Hz$ tied to the end of a string of length $1.2 m$ revolves at $400 \,rev/min$. A listener standing some distance away in the plane of rotation of whistle hears frequencies in the range (speed of sound $= 340 m/s$)
A simple harmonic progressive wave is represented by the equation : $y = 8\sin 2\pi (0.1x - 2t)$ where $x$ and $y$ are in $cm$ and $t$ is in seconds. At any instant the phase difference between two particles separated by $2.0 \,cm$ in the $x-$direction is ..... $^o$
An observer is riding on a bicycle and moving towards a hill at $18\,km\,h ^{-1}$. He hears a sound from a source at some distance behind him directly as well as after its reflection from the hill. If the original frequency of the sound as emitted by source is $640\,\,Hz$ and velocity of the sound in air is $320\,m / s$, the beat frequency between the two sounds heard by observer will be $...Hz$.