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

यदि संदर्भ ध्वनि दबाव स्तर 2 × 10-5 N/m 2 है, तो 90 dB का ध्वनि दबाव बराबर होगा

1
0.632 N/m2
2
0.707 N/m​2
3
0.835 N/m​2
4
0.925 N/m​2
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