A person is observing two trains one coming towards him and other leaving with the same speed $4\, m/s$. If their whistling frequencies are $240\, Hz$ each, then the number of beats per second heard by the person will be:(if velocity of sound is $320\, m/s$)
Medium
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1A travelling harmonic wave is represented by the equation $y(x, t) = 10^{-3}\,sin\,(50t + 2x)$, where $x$ and $y$ are in meter and $t$ is in seconds. Which of the following is a correct statement about the wave?View Solution
- 2In Quincke’s tube a detector detects minimum intensity. Now one of the tube is displaced by $5 \,\,cm$. During displacement detector detects maximum intensity $10$ times, then finally a minimum intensity (when displacement is complete). The wavelength of sound is .... $cm$View Solution
- 3A transverse wave of frequency $500 \,Hz$ and speed $100 \,m / s$ is travelling in the positive $x$-direction on a long string. At time $t=0 \,s$, the displacements at $x=0.0 \,m$ and at $x=0.25 \,m$ are $0.0 \,m$ and $0.02 \,m$, respectively. The displacement at $x=0.2 \,m$ at $t=5 \times 10^{-4} s$ is ............ $m$View Solution
- 4View SolutionWhen a longitudinal wave propagates through a medium, the particles of the medium execute simple harmonic oscillations about their mean positions. These oscillations of a particle are characterised by an invariant
- 5A police car with a siren of frequency $8 \ kHz$ is moving with uniform velocity $36 \ km / hr$ towards a tall building which reflects the sound waves. The speed of sound in air is $320 \ m / s$. The frequency of the siren heard by the car driver isView Solution
- 6The figure represents the instantaneous picture of a longitudinal harmonic wave travelling along the negative $x$-axis. Identify the correct statement $(s)$ related to the movement of the points shown in the figure. The stationary points areView Solution
- 7$Assertion :$ A transverse waves are produced in a very long string fixed at one end. Only progressive wave is observed near the free end.View Solution
$Reason :$ Energy of reflected wave does not reach the free end. - 8A standing wave $y = A sin \left( {\frac{{20}}{3}\pi \,x} \right) cos (1000\pi t)$ is maintained in a taut string where y and $x$ are expressed in meters. The distance between the successive points oscillating with the amplitude $A/2$ across a node is equal to ... $cm$View Solution
- 9Standing waves are produced in $10 \,m$ long stretched string fixed at both ends. If the string vibrates in $5$ segments and wave velocity is $20 \,m / s$, the frequency is ....... $Hz$View Solution
- 10The amplitude of a wave represented by displacement equation $y = \frac{1}{{\sqrt a }}\sin \omega t \pm \frac{1}{{\sqrt b }}\cos \omega t$ will beView Solution