पराश्रव्य तरंगों की आवृत्� – McqOptions

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1.	पराश्रव्य तरंगों की आवृत्ति होती है -
A.	20 KHZ से ऊपर
B.	20,000 KHZ के ऊपर
C.	20 KHZ से नीचे
D.	इनमें से कोई नही
Answer» B. 20,000 KHZ के ऊपर

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