The average power transmitted through a given point on a string supporting a sine wave is 0.20 W when the amplitude of the wave is 2.0 mm. What power will be transmitted through this point if the amplitude is increased to 3.0 mm.

Explanation

As power transmitted is proportional to the square of the amplitude.
`:. (P_(2))/(P_(1))=(A_(2)^(2))/(A_(1)^(2)) (P_(2))/(0.20)=((3)/(2))^(2)`
`P_(2)=0.20xx(9)/(4)=0.45wat t`