+917011494251 contact@prexms.com
Login
Login
Back
Formulas

Doppler Effect (Sound)

Observed frequency change due to relative motion.

Physics
Subject
Waves and Oscillations
Sub Subject
Sound Waves
Chapter
Doppler Effect
Topic

Doppler Effect (Sound)

📊 intermediate
$$f' = f\left(\frac{v \pm v_o}{v \mp v_s}\right)$$
Observed frequency change due to relative motion.
Variables & Units
$f'$
Observed frequency
Unit: $\text{Hz}$
$f$
Source frequency
Unit: $\text{Hz}$
$v$
Speed of sound in medium
Unit: $\text{m/s}$
$v_o$
Observer speed (relative to medium)
Unit: $\text{m/s}$
$v_s$
Source speed (relative to medium)
Unit: $\text{m/s}$
Key Information
📐 Derived From
Wavefront compression/rarefaction.
💡 Example
Ambulance siren at $f=500\,\text{Hz}$ moving toward you at $30\,\text{m/s}$ ($v=343\,\text{m/s}$): $f' = 500\left(\frac{343}{343-30}\right) \approx 548\,\text{Hz}$.
🔧 Applications
Radar speed guns, ultrasound blood flow, astronomy (redshift).
⚠️ Constraints
Non-relativistic speeds, sound in stationary medium.

Ready to start your journey?

Talk to an expert counsellor – absolutely free. We'll help you choose the right program.

Contact Us
Get In Touch

We're Here to Help You

Have questions about programs? Need guidance on which course fits you? Our team responds fast.

Talk to an Expert

Our counsellors help you pick the right program for your exam goal and timeline — completely free of charge.

Our Office

GRAWIO BANJARI INDUSTRIES PRIVATE LIMITED HD 463 WEWORK DLF FORUM, CYBERCITY PHASE III, DLF QE, Dlf Qe

Email Us

contact@prexms.com

Call / WhatsApp

+917011494251
🕐 Office Hours
Monday – Saturday 10 AM – 6 PM Open
Sunday Closed
📍 Walk in for free counselling — no appointment needed

Send a Message