what is the answer to this?
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a) No, the vibration is not audible to humans as the frequency is 1÷(5× 10^-6) i.e. 200000 Hz which is a frequency higher then the audible range of frequency. In other words it is a ultrasound.
b) The sound of the above frequency is ultrasound
c) It can be used in echocardiography to obtain the image of heart. It is also used by the Bats to detect any obstacle between their path. Also it is used for ultrasonography to obtain images of organs especially to detect stones etc. It is used to detect any defect in minor parts. SONAR (sound navigation and ranging) also use this application to measure the depth of sea or a ocean
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