Intensity of sound in normal conversation is

10 - 20

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30 - 60

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70 - 90

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120 - 150

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Solution

The correct option is C $30 - 60$ dB
The word noise can be defined as unpleasant or unwanted sound that causes discomfort and unease. Sound above 120 dB has the tendency to damage the human ear and can cause serious illness in the human body. Constant hearing of loud sounds can be associated with noise pollution caused by industries, traffic, machinery, aircraft, loudspeakers etc. The normal conversation sound ranges between 30-60 dB. Sounds above 60 dB are considered to be polluting.
Hence, the correct answer is '30-60 dB'.

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