The driver of a car travelling with a speed of \(30 \text{ ms}^{-1}\) towards a hill sounds a horn of frequency \(600\text{ Hz}.\) If the velocity of the sound in air is \(330\text{ ms}^{-1},\) then the frequency (in \(\text{Hz}\)) of the reflected sound as heard by the driver is \(\text{__________}.\)
byParag Zode