JEE Main Rank Booster 2021
This course will help student to be better prepared and study in the right direction for JEE Main..
₹ 13999/-
₹ 9999/-
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Object producing sound - Sound level in decibel(dB)
Jet take off-140
Pop concert-130
Police car siren-120
Heavy hammering machine-110
Diesel lorry-90
Motorcycle or r-80
Vacuum cleaner-60
Normal conversation-50
Soft whisper-30
Recording studio-20