ഒരു വ്യക്തിക്ക് അസ്വസ്ഥതയില്ലാതെ നേരിടാൻ കഴിയുന്ന ഒരു ശബ്ദത്തിന്റെ ഉച്ചനീചത്വം ഏകദേശം എത്ര ?
A150 dB.
B215 dB.
C30 dB.
D80 dB.
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