QuestionDoppler Effect - The whistle of a train emits a frequency of 440 Hz. - As it recedes from a stationary receiver at 30 $\mathrm{m} / \mathrm{s}$, what frequency does the observer hear?

Studdy Solution
Solve for the observed frequency.
Calculate the denominator:
$$343 + 30 = 373$$
Substitute back into the equation:
$$f' = \frac{440 \cdot 343}{373}$$
Calculate the observed frequency:
$$f' \approx \frac{151,120}{373} \approx 405.66 \, \text{Hz}$$
The frequency observed by the stationary receiver is approximately:
$\boxed{405.66 \, \text{Hz}}$