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Earn 100

The acronym ‘SONAR’ stands for

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Important Questions on Sound

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Science>Physics>Sound>Applications of Ultrasound

A person clapped his hands near a cliff and heard the echo after $4 s$ . The distance between the cliff and the person will be :

(Speed of sound is $346 m s^{- 1}$ )

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Science>Physics>Sound>Applications of Ultrasound

Sound travels at a speed of

1450 {ms}^{- 1}

through water. A submarine detects objects around it by sending sound waves and detecting echo (reflected sound) heard after

4 s

. Then the object must be at a distance of:

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Science>Physics>Sound>Applications of Ultrasound

If the velocity of sound in air is

340 m s^{- 1}

and

x

is the minimum distance between sound source and reflecting surface to get echo from general sound, then :

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Science>Physics>Sound>Applications of Ultrasound

Which of the following animal produce ultrasound?

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Science>Physics>Sound>Applications of Ultrasound

A girl drops a ball from a height

h = 20 m

. It strikes the ground elastically and returns to her hand. An echo of the thud of the ball striking the ground is produced from a nearby cliff. The echo is head at exactly the same moment when the ball returns to the girl's hand. (Take g =

10 {ms}^{- 2}

and

v_{sound} = 350 {ms}^{- 1}

). The distance of the cliff from the girls is close to:

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Science>Physics>Sound>Applications of Ultrasound

A man who is standing at a distance of

850 m

from a sound reflecting surface claps loudly. If the velocity of the sound in air is

340 {ms}^{- 1}

then the time taken by the echo to reach him is

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Science>Physics>Sound>Applications of Ultrasound

Narrow metal tubes, well polished from inside, are used in this experiment. The tubes should be narrow in order to make sound waves

MEDIUM

Science>Physics>Sound>Applications of Ultrasound

An incident sound wave strikes a reflecting surface at an angle of

50 °

. What is the angle between the incident wave and the reflected wave?

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Science>Physics>Sound>Applications of Ultrasound

Animals like dolphin produce

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Science>Physics>Sound>Applications of Ultrasound

In SONAR we use:

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Science>Physics>Sound>Applications of Ultrasound

A sonar device on a submarine sends out a signal and receives an echo

5 s

later. Calculate the speed of sound in water if the distance of the object from the submarine is

3625 m

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Science>Physics>Sound>Applications of Ultrasound

For doing the experiment on the verification of laws of reflection of sound,

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Science>Physics>Sound>Applications of Ultrasound

Which animal does not use the method of echolocation?

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Science>Physics>Sound>Applications of Ultrasound

While performing an experiment on verifying laws of reflection of sound, a student is to choose from (i) a narrow or a wide tube, and (ii) a strong or a faint source of sound.
The observed experimental difference, between the values of angle of incidence and angle of reflection, is likely to be minimum when he chooses a

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Science>Physics>Sound>Applications of Ultrasound

For verifying the laws of reflection of sound experimentally, the reflecting surface (screen) used should be

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Science>Physics>Sound>Applications of Ultrasound

Sound whose frequency is below