Sound waves having frequency shorter than audio frequency range
Sound waves produced in a vaccum
Sound waves having frequency higher than audio-frequency range
None of these
A
Sound waves produced in a vaccum
B
Sound waves having frequency higher than audio-frequency range
C
Sound waves having frequency shorter than audio frequency range
D
None of these
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Solution
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The audible frequency range for human ear is from 20Hz to 20000Hz , above frequency 20000Hz , sound waves are called ultrasonic and below 20Hz , they are infrasonic . So it is clear that sound waves having frequency higher than audio frequency range (20.000Hz) , are ultrasonic waves .
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Assertion :Ultrasonic waves are longitudinal waves of frequency grater than 20,000Hz Reason: The maximum frequency of audible sound waves is 20,000Hz
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Q5
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