Question:medium
A source of sound S emitting waves of frequency 100Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4m s⁻1 at an angle of 60^∘ with the source–observer line as shown in the figure. The observer is at rest. Find the apparent frequency observed by the observer. (Velocity of sound in air =330m s⁻1).
A source of sound S emitting waves of frequency 100Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4m s⁻1 at an angle of 60^∘ with the source–observer line as shown in the figure. The observer is at rest. Find the apparent frequency observed by the observer. (Velocity of sound in air =330m s⁻1).
Show Hint
In Doppler effect problems:
vₛ = vcosθ
Only the velocity component along the line of sight causes frequency change.
Updated On: Mar 19, 2026
- \(103\,\text{Hz}\)
- \(106\,\text{Hz}\)
- \(97\,\text{Hz}\)
- 100Hz
Show Solution
The Correct Option is A
Solution and Explanation
Was this answer helpful?
0
Top Questions on doppler effect
- A passenger is sitting in a fast moving train. The engine of the train blows a whistle of frequency N. If the apparent frequency of sound heard by the passengers is \( N' \), then:
- MHT CET - 2025
- Physics
- doppler effect
- A train is moving with a speed of \(10 m/s\) towards a platform and blows a horn with frequency \(400 Hz\). Find the frequency heard by a passenger standing on the platform. Take speed of sound = \(310 m/s\).
- JEE Main - 2023
- Physics
- doppler effect
A source of sound is moving away from a stationary observer with constant velocity 40 m/s. Find frequency heard by observer, if original frequency of source is 400 Hz and speed of sound in air is 360 m/s
- JEE Main - 2023
- Physics
- doppler effect
- A car P travelling at 20 \(ms^{–1}\) sounds its horn at a frequency of 400 Hz. Another car Q is travelling being the first car in the same direction with a velocity 40 \(ms^{–1}\) . The frequency heard by the passenger of the car Q is approximately [Take, velocity of sound = 360 \(ms^{–1}\) ]
- JEE Main - 2023
- Physics
- doppler effect
- Want to practice more? Try solving extra ecology questions todayView All Questions