GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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90 decibel
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95 decibel
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80 decibel
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85 decibel
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Detailed explanation-1: -Humans have a hearing threshold of around 0 decibels. Above this threshold, sounds with higher sound pressure levels are heard as louder noises. Sounds above 90 dB can lead to chronic hearing damage if people are exposed to them every day or all the time.
Detailed explanation-2: -Answer in terms of 10−6W/m2. Hint : First of all find the ratio of the sound intensity to the threshold intensity.
Detailed explanation-3: -The unit of intensity of sound is decibel (dB). It is used to calculate sound intensity and other physical quantities. Decibel is a tenth of the auxiliary unit of measurement Bel, which was named after the inventor Alexander Graham Bell. The value expressed in decibels is the sound pressure level or sound level.