A friend of yours is loudly singing a single note at 411 Hz while racing toward you at 25.5 m/s on a day when the speed of sound is 341 m/s. 1) what

A friend of yours is loudly singing a single note at 411 Hz while racing toward you at 25.5 m/s on a day when the speed of sound is 341 m/s.1) what frequency do you hear? 2) What frequency does your friend hear if you suddenly start singing at 411 Hz?