# Can Physics hear my cry ?

Classical Mechanics Level 3

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 $$\text{__________}.$$

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