Points$]$

OSCOLPHYS$217\mathrm{.}4.$P$\mathrm{.}034.$

A commuter train blows its $200$ Hz horn as it approaches a crossing. The speed of sound is $333\frac{m}{s}.$

$($a$)$ An observer waiting at the crossing receives a frequency of $211$ Hz $.$ What is the speed of the train $($in $\frac{m}{s})?$

$17\mathrm{.}4\frac{m}{s}$

$($b$)$ What frequency $($in Hz $)$ does the observer receive as the train moves away?

HzIuk