What frequency is heard by an observer who hears the 450 Hz siren on a police car

traveling at 35 m/s away from her? Assume that the velocity of sound in air is 345 m/s.

Is this the correct?
450*345/(345+35)
=408Hz

1 answer

yes
http://hyperphysics.phy-astr.gsu.edu/hbase/sound/dopp.html#c4