Question:শব্দোত্তর তরঙ্গের কম্পাঙ্ক কত? 

A 20 Hz 
B 20 Hz- 20000 Hz 
C 2000 Hz 
D 20000 Hz এর বেশি 

+ Answer
D 

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Md. Sohel Arman

Editor, VCampus

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