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A train, standing in a station yard, blows a whistle of frequency $400 \,\,Hz$ in still air. The wind starts blowing in the direction from the yard to the station with a speed of $10\,\,m/s.$ Given that the speed of sound in still air is $340\,\,m/s.$ Mark the INCORRECT statement :
If $n _{1}, n_{2}$ and $n _{3}$ are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency $n$ of the string is given by
$Assertion :$ For the formation of stationary waves the medium must be bounded having definite boundaries.
$Reason :$ In the stationary wave, some particles of the medium remain permanently at rest.
A wave is propagating along $x$-axis. The displacement of particles of the medium in $z$-direction at $t = 0$ is given by: $z =$ exp$[ -(x + 2)^2]$ , where $‘x’$ is in meters. At $t = 1s$, the same wave disturbance is given by: $z =$ exp $ [ - (2 - x)^2 ]$. Then, the wave propagation velocity is
The frequency of transverse vibrations in a stretched string is $200 Hz$. If the tension is increased four times and the length is reduced to one-fourth the original value, the frequency of vibration will be .... $Hz$
The ratio of densities of nitrogen and oxygen is $14:16.$ The temperature at which the speed of sound in nitrogen will be same at that in oxygen at $55^oC$ is ..... $^oC$