railway RRB JE (CBT I + CBT II) Mock Test 2024 Physics Waves Intensity and Sound Level

औद्योगिक क्षेत्र में दिन के समय अनुमेय ध्वनि स्तर कितना है?

1
40 dB (A)
2
75 dB (A)
3
120 dB (A)
4
140 dB (A)
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