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qUESTIONS

At what temperature will the speed ofsound in air be 1.75 times its speed atN.T.P?

Sound wave A has period 0.015 s, sound wave B has period 0.025. Which sound has greater frequency?

A girl stands 170 m away from a highwall and claps her hands at a steady rateso that each clap coincides with the echoof the one before.a) If she makes 60 claps in 1 minute,what value should be the speed of soundin air?b) Now, she moves to another locationand finds that she should now make45 claps in 1 minute to coincide withsuccessive echoes. Calculate her distancefor the new position from the wall.

An echo-sounder in a fishing boatreceives an echo from a shoal of fish0.45 s after it was sent. If the speed ofsound in water is 1500 m/s, how deep isthe shoal?

A tuning fork of frequency 170 Hzproduces sound waves of wavelength 2m. Calculate speed of sound.

A bat, flying at velocity Vᴮ = 12.5m/s, is followed by a car running at velocity Vᴮ= 50 m/s. Actual directions of the velocities of the car and the bat are as shown in the figure below, both being in the same horizontal plane(the plane of the figure). To detect the car, the bat radiates ultrasonic waves of frequency36 kHz. Speed of sound at surrounding temperature is 350 m/s. There is an ultrasonic frequency detector fitted in the car. Calculate the frequency recorded by this detector. The ultrasonic waves radiated by the bat are reflected by the car. The bat detects these waves and from the detected frequency, it knows about the speed of the car. Calculate the frequency to the reflected waves as detected by the bat. (sin 37° = cos 53° = 0.6, sin 53° = cos37° = 0.8)

A rocket is moving at a speed of220 m/s towards a stationary target. It emits a wave of frequency 1200 Hz. Some of the sound reaching the target gets reflected back to the rocket as an echo. Calculate (1) The frequency of sound detected by the target and (2) The frequency of echo detected by rocket (velocity of sound= 330 m/s.)

A man shouts loudly close to ahigh wall. He hears an echo. If the man is at40 m from the wall, how long after the shout will the echo be heard ? (speed of sound in air=330 m/s)

Consider a closed box of rigid walls so that the density of the air inside it1s constant. On heating, the pressure of this enclosed air is increased from P₀ to P. It is now observed that sound travels 1.5 times faster than at pressure P₀ calculate P/P₀.

Suppose you are listening to anout-door live concert sitting at a distance of 150m from the speakers. Your friend is listeningto the live broadcast of the concert in anothercountry and the radio signal has to travel 3000km to reach him. Who will hear the music firstand what will be the time difference betweenthe two? Velocity of light =3×10⁸ m/s and thatof sound 1s 330m/s.

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