The document discusses the Doppler effect and how it applies in daily life. It explains that the frequency and wavelength of sound from a moving source changes due to the Doppler effect. The Doppler effect formula can be used to calculate these changes depending on whether the source, observer, or both are stationary or moving towards or away from each other. Finally, examples are given of how the Doppler effect is used in devices like police radar guns, medical ultrasound, and astronomy.

1. Topic 2b
Doppler effect
Doppler effect concept
Doppler effect in daily life

3. Observe the diagrams above and answer the questions below.
1. Does the frequency and wavelength of the sound from the source
change when the source is moving?
2. What actually caused the change in the frequency and
wavelength of the sound that we hear?

4. Doppler effect formula
Formula is used for cases where the source
is stationary, observer is stationary or both
are moving.
1. When the observer is stationary, Vo = 0
2. When the source is stationary, Vs = 0
3. When the observer and/or source is
approaching each other, Vo + , Vs –
4. When the observer and/or source is
moving away from each other, Vo - , Vs +
Write down the formula for the cases below.
1. Source moving towards a stationary
observer.
2. Source and observer both moving
towards each other.
3. Source moving away from a stationary
observer.
4. Source and observer, both moving away
from each other.

5. Tutorial: Doppler’s real life examples and use
https://studiousguy.com/doppler-effect-examples/
1. Sirens
2. Acoustic Doppler Current Profiler (ADCP)
3. Police Radar Guns
4. Pulse Doppler Radar
5. Doppler Echocardiogram
6. Laser Doppler Anemometer
7. Audio Applications
8. Satellites
9. Astronomy
10. Sonic Boom