Question

If the wavelength of reflected waves is $\frac{x}{10}m$. Find $x$

Answer 1

let apparent frequency be $f_1$

source is moving in positive direction while reflective surface is moving in opposite direction

$f_1=\frac{v+v_o}{v-v_s}f=\frac{332+64}{332-32}\times 1000=1320Hz$

hence the wavelength is $\lambda =\frac{c}{f}=\frac{332}{1320}=0.25m$

therefore x = 2