Question

A sound wave emitted by a vibrator has a frequency of 4000 Hz:
(i) Name the type of wave.
(ii) Give one medical use of the wave mentioned in (i).
(iii) Two aeroplanes A & B moving at speeds 250m/s and 350m/s respectively. Give a special name to the speed of the aeroplane B.


plz .... answer the above given questions.... it's very urgent.





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Answer 1

refer to the attachement

Answer 2

Answer:

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