JEE (Based on NTA Guidelines-IIT Engg.) Mains Physics Oscillations and Waves-Doppler Effect in Sound Study Material (Page 1 of 2)

Choose Programs:

📹 Video Course 2024 (0 Lectures [0 mins]): Offline Support

Rs. 100.00 -OR-

1 Month Validity (Multiple Devices)

Preview All LecturesDetails

🎓 Study Material (575 Notes): 2024-2025 Syllabus

Rs. 650.00 -OR-

3 Year Validity (Multiple Devices)

Topic-wise Notes & SampleDetails

🎯 228 Numeric, 4619 MCQs (& PYQs) with Full Explanations (2024-2025 Exam)

Rs. 750.00 -OR-

3 Year Validity (Multiple Devices)

CoverageDetailsSample Explanation

Help me Choose & Register (Watch Video) Already Subscribed?

What is Doppler Effect of Sound?

Edit

If observer moves towards a stationary source of sound with high speed then the frequency of the sound heard appears to be higher than that of the source. Similarly, if observer moves away from the source, then the observed frequency becomes lower than that of the source. This motion related to change in frequency; is first proposed by the Austrian physicist John Christian Doppler; therefore, this motion is called Doppler effect.

Doppler effect is used to measure the speed at which stars and galaxies are approaching or receding from us, in a mechanism named red shift or blue shift. Redshift happens when light seen coming from an object that is moving away is proportionally increased in wavelength, or s…

… (260 more words) …

Subscribe (by clicking here) to view full notes and track progress.

Expression of Doppler Shift when Source is Moving and Observer is Stationary:

Edit
  • Let the direction from the observer to the source as the positive direction of velocity.
  • Let considering a source moving with velocity and in a frame, at where an observer is stationary. And the angular frequency and period of wave are and , respectively which are measured by an observer at rest with respect to the medium. And the velocity of the wave is .
    Source Moving, Observer Stationary
  • Here it is assumed that the observer has a detector that counts every time a wave crest reaches it. As shown in figure, the source is at point

… (408 more equations, 17 figures) …

Subscribe (by clicking here) to view full notes and track progress.