Question

Two cars moving in opposite directions approach each other with speed of $22m{s}^{-1}$ and $16.5m{s}^{-1}$ respectively. The driver of the first car blows a horn having a frequency $400Hz$ . The frequency heard by the driver of the second car is [velocity of sound $340m{s}^{-1}$ ]:

Answer 1

Answer: 448

As we know for given condition
$f_{\text{app}}=f_0\left(\frac{v+v_{\text{observer}}}{v-v_{\text{source}}}\right)=400\left(\frac{340+16.5}{340-22}\right)$
$f_{\text{app}}=448Hz$