A car moving with a velocity of 36 km/hr crosses a siren of frequency 500 Hz.

A Car Moving With A Velocity Of 36 Kmhr Crosses Physics Question

A car moving with a velocity of 36 km/hr crosses a siren of frequency 500 Hz. The apparent frequency of siren after passing it will be

Options

(a) 520 Hz
(b) 485 Hz
(c) 540 Hz
(d) 460 Hz

Correct Answer:

485 Hz

Explanation:

Velocity of the car = 36000 m / 3600 s = 10 m/s
ʋemitted = 500 Hz, ʋsound = 330 m/s
ʋobs = ʋemitted [(ʋsound – ʋobs) / ʋsound]
Observed frequency ʋobs = 500 [(300 – 10) / 300]
⇒ ʋobs = 485 Hz

Related Questions:

  1. A charge Q is uniformly distributed over a large plastic plate. The electric field
  2. A body with mass 5 kg is acted upon a force F=(-3i+4j) N.If its initial velocity at
  3. Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state
  4. A vertical spring with force constant k is fixed on a table. A ball of mass
  5. Two racing cars of masses m₁ and m₂ are moving in circles of radii

Topics: Waves (80)
Subject: Physics (2479)

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*