Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 General Science Physics Wave

একটি শব্দ উৎসের কম্পাঙ্ক 50 Hz, 2 সেকেন্ডে কম্পনের সংখ্যা হবে:

1
25
2
50
3
100
4
200
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