UNIT 11 NUMERICALS
SOUND
NUMERICAL NO: 11.1
A normal conversion involves sound intensities of about 3.0 x 10-6 Wm-2 . What is the decibel level of this intensity? What is the intensity of the sound for 100 dB?
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NUMERICAL NO: 11.2
If at Ananrkali bazaar Lahore, the sound level is 80 dB. What will be the intensity of sound there?
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NUMERICAL NO: 11.3
At a particular temperature, the speed of sound in air is 330 ms-1 . If the wavelength of a note is 5 cm, calculate the frequency of the sound wave. Is this frequency lies in the audible range of the human ear?
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NUMERICAL NO: 11.4
A doctor counts 72 heart beats in 1 min. calculate the frequency and period of the heart beat.
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NUMERICAL NO: 11.5
A marine survey ship sends sound wave straight to the sea bed. It receives an echo 1.5 s later. The speed of sound in sea water is 1500 ms-1 . Find the depth of the sea at this position.
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NUMERICAL NO: 11.6
A student clapped his hand near a cliff and heard the echo after 5 s. what is the is the distance of the cliff from the student if the speed of the sound, v is taken as 346 ms-1 .
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NUMERICAL NO: 11.7
A ship sends out ultrasound that returns from the seabed and is detected after 3.42 s. If the speed of ultrasound through seawater is 1531 ms-1 , what is the distance of seabed from ship?
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NUMERICAL NO: 11.8
The highest frequency sound human can hear is about 20,000 Hz. What is the wavelength of sound in air at this frequency at a temperature of 20 o C? What is the wavelength of lowest sound we can hear of about 20 Hz? Assume the speed of sound is 343 ms-1 .
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NUMERICAL NO: 10.9
A sound wave has a frequency of 2 kHz and wavelength 35 cm. how long will it take to travel 1.5 km?
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