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Infrasonic, Ultrasonic and Audio waves

Why do ultras...

Question

Why do ultrasound waves produce images of objects inside the body more effectively than audible sound waves do?

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Solution

It happens because the penetrating power of ultrasound is higher than audible sound due to its greater frequency (20.000Hz) than audible sound frequency (20Hz) i.e. because of shorter wavelength .

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Q. The speed of highly penetrating ultrasonic waves is :
(a) lower than those of audible sound waves
(b) higher than those of audible sound waves
(c) much higher than those of audible sound waves
(d) same as those of audible sound waves

Q. Question 7
Earthquake produces which kind of sound before the main shock wave begins

(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above

Q. Question 7
Earthquake produces which kind of sound before the main shock wave begins

(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above

Q. Sound waves of wavelength greater than that of audible sound are called ________.

Q. Assertion :Ultrasonic waves are longitudinal waves of frequency grater than

20, 000 H z

Reason: The maximum frequency of audible sound waves is

20, 000 H z

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