Question

The intensity of a sound source is measured 3.0 m from the source and it found to be 4.0W/m2. Calculate the intensity received at:
a) 1.0 m
b) 5.0 m

Answer 1

Answer:

Explanation: I2/i1 =R1²/R2²

                     I2/4.0 =3²/1²

                     cross multiply

                      I2 =36W/m²

                     At a distance of 1.0m the intensity is 36W/m²

                     I2/I1 =R1²/R2²

                     I2/4.0 =3²/5²

                     25I2 =36

                      I2 =1.44W/m²

                       At a distance of 5.0m the intensity is 1.44W/m²