শব্দোত্তর তরঙ্গের কম্পাঙ্ক কত?

A 20 Hz এর কম

B 20 Hz - 20000 Hz

C 200 Hz এর কম

D 20000 Hz এর বেশি

Correct Answer & Explanation

Option D

Option D is the correct answer according to official curriculum guidelines.

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