Answer Posted / sundhara narasimhan

0 dB is the auditory threshold at 1 kHz. Frequency between 2kHz and 4kHz is lowest frequency level that is heard by human.

Human perception level is 0 dB.
Hearing damage during long-term effect is approx. 90 dB.
Hearing damage during short-term effect is approx. 120 dB.
Threshold of pain happens at 134 dB.

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