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

Other things remaining the same the power transmitted is proportioN/Al to the square of the amplitude
Thus, `P_2/P_1=A_2^2/A_1^2`
or, `P_2/(0.20W)=9/4=2.25`
or, `P_2=2.25xx0.2W=0.45W`