SLIDE 1
Wave Properties
Recall that the wavelength is the distance between two peaks.
Doppler Effect and Redshift Wave Properties Recall that the - - PowerPoint PPT Presentation
Doppler Effect and Redshift Wave Properties Recall that the - - PowerPoint PPT Presentation
Doppler Effect and Redshift Wave Properties Recall that the wavelength is the distance between two peaks. Wave Properties Frequency (f)-the number of waves passing a particular point in one second Longer wavelength=lower frequency
SLIDE 2
SLIDE 3
Wave Properties
Frequency (f)-the number of waves passing a particular point in one second
- Longer wavelength=lower frequency
- Shorter wavelength=higher frequency
SLIDE 4
Doppler Effect
- When there is relative motion
between a source and an
- bserver the Doppler Effect
- ccurs.
○ Motion towards each other=higher
- frequency. A higher pitch is heard by
the observer. ○ Motion away from each other=lower
- frequency. A lower pitch is heard by
the observer ○ The Doppler effect can be observed in any type of wave: water wave, sound wave, light wave
SLIDE 5
Doppler Effect
Explain the following visual. How might the sounds be different?
SLIDE 6
Doppler Effect
SLIDE 7
Electromagnetic Waves
- Recall that light behaves as a wave.
- How might light detected from a star that is moving
away from an observer be different that the light detected from a star moving toward an observer?
SLIDE 8
Redshift
- Occurs when a light emitting
- bject is moving away from an
- bserver. This might be a star
- r a galaxy in our case.
- The wavelength of light emitted
is stretched out.
- This shifts the light towards the
longer wavelengths of the spectrum-ie: red.
SLIDE 9
Hubble’s Discovery
- Hubble observed that the wavelength of light
coming from distant galaxies was experiencing redshift .
- This means the light source is moving away
from the observer and increasing in wavelength (doppler effect).
- The longer the light travels, the more it gets
redshifted
SLIDE 10
SLIDE 11