The frequency of ultrasonic waves is - – McqOptions

MCQOPTIONS

1.	The frequency of ultrasonic waves is -
A.	20 KHZ से ऊपर
B.	20,000 KHZ के ऊपर
C.	20 KHZ से नीचे
D.	none of these
Answer» B. 20,000 KHZ के ऊपर

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