The Doppler Shift. Brought to you by McCourty-Rideout enterprises- tuned into your frequency. image is courtesy of Windows to the Universe, http://www.windows.ucar.edu. Astronomy and the Doppler Shift. Astronomers can measure the Doppler Shift of a moving object.
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Brought to you by McCourty-Rideout enterprises- tuned into your frequency
image is courtesy of Windows to the Universe, http://www.windows.ucar.edu.
The Doppler shift formula for a moving source:
where λ1 is the unshifted wavelength
λ2 is the shifted wavelength
c is the speed of light and
v is the velocity of the object emitting the light, relative to the observer
and c = 3 x 108 m/s
= [(3999 – 4000)/4000]•3 x 108
= -7.5 x 104 m/s
Is the source coming towards us or away from us?
The Doppler shift is called a
“Red shift” if v > 0 (moving away) since the wavelength is getting longer and the frequency shorter
“Blue Shift” if v < 0 (moving closer) since the wavelength is getting shorter and the frequency higher
(recall that blue light is higher in frequency than red)
To try another example click here. http://www.windows.ucar.edu.
If not proceed to the next slide.