The walls of the halls built for music concerts should
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- 1A musician using an open flute of length $50\,cm$ produces second harmonic sound waves. A person runs towards the musician from another end of a hall at a speed of $10 \,km/h.$ If the wave speed is $330\,m/s,$ the frequency heard by the running person shall be close to...... $Hz$View Solution
- 2A composition string is made up by joining two strings of different masses per unit length $\rightarrow \mu$ and $4\mu$ . The composite string is under the same tension. A transverse wave pulse $: Y = (6 mm) \,\,sin\,\,(5t + 40x),$ where $‘t’$ is in seconds and $‘x’$ in meters, is sent along the lighter string towards the joint, the percentage of power transmitted to the heavier string through the joint is approximately ..... $\%$View Solution
- 3In stationary waves, distance between a node and its nearest antinode is $20 cm$. The phase difference between two particles having a separation of $60 cm$ will beView Solution
- 4A motor cycle starts from rest and accelerates along a straight path at $2 \;m / s ^{2}$. At the starting point of the motor cycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of the siren at $94 \%$ of its value when the motor cycle was at rest?View Solution
(Speed of sound $=330 ms ^{-1}$)
- 5A sound absorber attenuates the sound level by $20\ dB$. The intensity decreases by a factor ofView Solution
- 6A string of length $1 \mathrm{~m}$ and mass $2 \times 10^{-5} \mathrm{~kg}$ is under tension $\mathrm{T}$. when the string vibrates, two successive harmonics are found to occur at frequencies $750 \mathrm{~Hz}$ and $1000 \mathrm{~Hz}$. The value of tension $\mathrm{T}$ is. . . . . . .Newton.View Solution
- 7An engine giving whistle is moving towards a stationary observer with $110\, m/s$ speed. What will be the ratio of the frequency of the whistle heard when the engine is approaching and receding from the observer ? (Speed of sound $= 330\, m/s$)View Solution
- 8If fundamental frequency of closed pipe is $50\,Hz$ then frequency of $2^{nd}$ overtone is .... $Hz$View Solution
- 9$Assertion :$ 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. - 10Two identical coherent sound sources $R$ and $S$ with frequency $f$ are $5 \,m$ apart. An observer standing equidistant from the source and at a perpendicular distance of $12 \,m$ from the line $R S$ hears maximum sound intensity.When he moves parallel to $R S$, the sound intensity varies and is a minimum when he comes directly in front of one of the two sources. Then, a possible value of $f$ is close to ............ $Hz$ (the speed of sound is $330 \,m / s$ )View Solution