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What are the different uses of ultrasonic sound?

Important Questions on Study of Sound

EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Using sonar, sound pulses are emitted at the surface. The pulses, after being reflected from the bottom, are detected. If the time interval from the emission to the detection of the sound pulses is 2 seconds, find the depth of the water. (take velocity of sound through water, v=1500 m/s)
MEDIUM
Science>Physics>Study of Sound>Audible, Infra and Ultrasound

What is an echo? Explain how the principle of echo is used by

a. bat during its flight at night and

b. a dolphin to locate small fishes as its prey. 

EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Bats sense obstacles through their ears.
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Why do we prefer ultrasonic sound over other frequencies like X-rays for medical applications?
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Name the instrument used to receive sound waves under water.
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
_____ beam used for underwater observation, communication and navigation in the study of oceanography.
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
An echo is heard in 5 seconds. What is the distance between the reflecting surface and the source of sound? Given the speed of sound is 344 m/s.
MEDIUM
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Which type of frequency is used by bats for catching their prey?
MEDIUM
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Radiowaves sent from the earth towards the surface of moon are received back on the earth after reflection in 2.5 seconds. If the velocity of radiowaves is 3×108m/s, calculate the distance of the moon from the earth.
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Name the scientist who discovered the special mechanism in bats.
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Why do we not hear echo at all places?
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Although sound is produced due to repeated vibratory motion yet a vibrating pendulum does not produce sound? Why?
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
In industry ultrasonic waves are widely employed for quality control testing.
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Why do the stages of auditoriums have curved background, curtains, carpets and false ceilings?
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Bats can sense _____ sound.
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m s-1, how far away is the cliff?
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
Cotyledons are also called-
MEDIUM
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
What is echocardiography?
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound
What are two uses for ultrasound?
EASY
Science>Physics>Study of Sound>Audible, Infra and Ultrasound

Give reasons for the following:

We cannot hear any sound on vibrating our hands forward and backwards.