The Doppler effect is an apparent change in frequency or wavelength of a wave caused by relative motion between the source and observer. The document discusses the Doppler effect as it relates to sound waves and light waves, explaining that a moving source toward the observer results in a higher frequency (blueshift), while a moving source away results in a lower frequency (redshift). It also discusses cosmological redshift caused by the expansion of the universe.

1. Doppler Effect

2. DOPPLER EFFECT
An apparent shift in frequency of a
wave caused by relative motion between
the source of the wave and the observer.

3. FREQUENCY
the rate at which a vibration occurs that
constitutes a wave, either in a material (as in
sound waves), or in an electromagnetic field (as
in radio waves and light), usually measured per
second.

4. Wavelength
 the distance between
successive crests of a wave,
especially points in a sound
wave or electromagnetic
wave.
Pitch
The highness or lowness of
sound.

5. SOUND WAVES

7. A moving sound source and a stationary
observer.

9. WATER WAVES

13. REDSHIFT and
BLUESHIFT
By: Lily Rosemary L. Masilang
BSE-III

14. What is REDSHIFT?
REDSHIFT- term used when light is shifted
toward lower frequencies or toward the red
end of the spectrum.
Higher wavelength, lower frequency

16. Cosmological redshift
a redshift caused by the expansion of space.
3 Types of Redshift
– From the universe expansion
– From the movement of galaxies relative to each
other
– From “gravitational redshift” which happens
when light is shifted due to the massive amount
of matter inside of a galaxy.

17. What is BLUESHIFT?
BLUESHIFT - term used when visible light is
shifted toward higher frequencies or toward
the blue end of the spectrum.
Lower wavelength, higher frequency

19. Blueshift is not something you see with your
eyes.
It is determined by the study of the
wavelengths of light
Spectrometer or spectrograph- an instrument
used to dissect light.

20. Remember:
Redshift and blueshift are used to refer to any
range of wavelengths.
Red and blue refer to the relative direction of
the shift not the color.

21. Remember:
Redshift- away from us or shifted towards the
red end of the spectrum
 higher wavelength- lower frequency
Blueshift- towards us or shifted towards the
blue end of the spectrum.
lower wavelength-higher frequency

22. THANK YOU 

23. • http://coolcosmos.ipac.caltech.edu/cosmic_cl
assroom/cosmic_reference/redshift.html
• http://www.space.com/25732-redshift-
blueshift.html
• Wikipedia