The intensity of sound at a point is the time rate of flow of sound energy passing normally through a unit area at the point. Its unit is the joule per sec. sq. m (J/s.m2) or watt per square metre (W/m2).
Question : Decibel is the unit used for:
Option 1: speed of light
Option 2: intensity of heat
Option 3: intensity of sound
Option 4: radio wave frequency
Question : Dioptre is the unit of:
Option 1: power of a lens
Option 2: focal length of a lens
Option 3: light intensity
Option 4: sound intensity
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