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- 1A man standing on a platform observes that the frequency of the sound of a whistle emitted by a train drops by $140 Hz$. If the velocity of sound in air is $330 \,m / s$ and the speed of the train is $70 \,m / s$, the frequency of the whistle is .......... $Hz$View Solution
- 2To increase the frequency from $100 Hz$ to $400 Hz$ the tension in the string has to be changed by ..... $times$View Solution
- 3A car $'A'$ chasing another car $'B'$ with a speed of $20\, m/s$ sounding a horn of $180\, Hz$. While both cars are moving towards a stationary siren of frequency $170\, Hz$. What is the speed of car $B$ so that it can't hear any beat ....$m/s$ (speed of sound $= 340\, m/s$)View Solution
- 4An open pipe is suddenly closed at one end with the result that the frequency of third harmonic of the closed pipe is found to be higher by $100 Hz,$ then the fundamental frequency of open pipe is .... $Hz$View Solution
- 5Two waves of wavelengths $99\, cm$ and $100\, cm$ both travelling with velocity $396\, m/s$ are made to interfere. The number of beats produced by them per second isView Solution
- 6Two closed organ pipes of length $100 \,cm$ and $101 \,cm$ $16$ beats in $20\, sec$. When each pipe is sounded in its fundamental mode calculate the velocity of sound .... $ms^{-1}$View Solution
- 7Tuning fork ${F_1}$ has a frequency of $256 Hz$ and it is observed to produce $6$ beats/second with another tuning fork ${F_2}$. When ${F_2}$ is loaded with wax, it still produces $6$ beats/second with ${F_1}$. The frequency of ${F_2}$ before loading was ..... $Hz$View Solution
- 8Two tuning forks $A$ and $B$ vibrating simultaneously produce $5$ beats. Frequency of $B$ is $512.$ It is seen that if one arm of $A$ is filed, then the number of beats increases. Frequency of $A$ will beView Solution
- 9A travelling wave in a stretched string is described by the equation $y = A\sin (kx - \omega t)$. The maximum particle velocity isView Solution
- 10A transverse wave is given by $y = A\sin 2\pi \left( {\frac{t}{T} - \frac{x}{\lambda }} \right)$. The maximum particle velocity is equal to $4$ times the wave velocity whenView Solution