1. Tardigrade
  2. Question
  3. Physics
  4. Figure below shows boat and river with their respective speeds. S is a source, attached to the boat, that emits sound of wavelength 14.45mm at a speed of 1445m/s w.r.t water. A receiver is kept downstream at rest w.r.t. ground, inside water. The frequency detected by the receiver is:- <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-j9zr0i4lvwojly0o.jpg />

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Figure below shows boat and river with their respective speeds. $S$ is a source, attached to the boat, that emits sound of wavelength $14.45mm$ at a speed of $1445m/s$ w.r.t water. A receiver is kept downstream at rest w.r.t. ground, inside water. The frequency detected by the receiver is:-
Question

NTA AbhyasNTA Abhyas 2020

Solution:

$v=f\lambda $
$f=10^{5}Hz$
$\Rightarrow $ Velocity of sound w.r.to ground
$=1447\frac{m}{s}$
$\Rightarrow f_{app}=\frac{1447}{1447 - 10}\times 10^{5}$
$=100695.9Hz$