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qUESTIONS

The sound emitted from the siren of anambulance has frequency of 1500 Hz.The speed of sound is 340 m/s. Calculatethe difference in frequencies heard bya stationary observer if the ambulanceinitially, travels towards and then awayfrom the observer at a speed of 30 m/s.

A certain sound wave in air has a speed340 m/s and wavelength 1.7 m for this wave, calculate a) the frequency b) the period.

A police car travels towards a stationaryobserver at a speed of 15 m/s. The sirenon the car emits a sound of frequency 250Hz. Calculate the recorded frequency.The speed of sound is 340 m/s.

A man standing between 2 parallel liffsfires a gun. He hears two echos oneafter 3 seconds and other after 5 seconds.The separation between the two cliffs i1s1360 m, what is the speed of sound?

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)

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