if noise voltage =120 mv and signal voltage = 80 v , S/N ratio in dB is?

if noise voltage =120 mv and signal voltage = 80 v , S/N ratio in dB is?
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Sounds above what level are considered hazardous noise pollution? (a) Above 80 dB (b) Above 30 dB (c) Above 150 dB (d) Above 120 dB

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