A girl swings in a cardle with period pi//4 second and amplitude 2m. A boy standing infront of it blows a whistle of natural frequency 1000Hz. The minimum frequency as heard by the girl is (Velocity of sound in air is 320ms^(-1))

A girl swings in a cardle with period pi//4 second and amplitude 2m. A

1.	A girl swings in a cardle with period pi//4 second and amplitude 2m. A boy standing infront of it blows a whistle of natural frequency 1000Hz. The minimum frequency as heard by the girl is (Velocity of sound in air is 320ms^(-1))
Answer» `850Hz` `1000Hz` `750HZ` `950Hz` SOLUTION :`V_(0)=V_(g)=omegaA=(2piA)/(T)=(2pixx2)/(pi//4)=16m//s` `V_(s)=V_(b)=0n_(MIN)=((V-V_(0))/(V))n`