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B
below
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C
above
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D
between and
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Solution
The correct option is C
above
Ultrasonic wave:
It is a longitudinal wave.
When an electrical signal generator provides a pulse of electrical energy to a piezoelectric crystal in a transducer, the crystal vibrates, converting the electrical pulses into mechanical vibrations then ultrasonic waves are produced.
The inaudible sound having frequency is more than is termed as Ultrasonic wave.