Lesson9_Doppler Effect.notebook 1 October 21, 2013
Lesson9 Doppler Effect.notebookkanthonywvhs.weebly.com/.../lesson9_dopplereffect.pdf · Lesson9_Doppler Effect.notebook 7 October 21, 2013 Red Shift or Blue Shift...? When a star
Discuss the racetrack sound phenomenon as well as the passing by in a moving car...approaching train.The apparent change in frequency when the source is moving. To an observer in front of the moving sound source the frequency seems higher, while behind the source the frequency seems lower.
Lesson9_Doppler Effect.notebook
3
October 21, 2013
The equation for the Doppler Effect for Light ...
cf2 = f1 (1 + vr )
f1 frequency emitted from the source
f2 frequency observed
vr relative velocity between the source and the observerc speed of light
* Use + when objects are approaching each otherUse when objects are moving away from each other
Lesson9_Doppler Effect.notebook
4
October 21, 2013
Radar Guns
vr = f c2f1(
)
Astronomyvr = c(
)
Lesson9_Doppler Effect.notebook
5
October 21, 2013
Ex.1 A stationary police car aims a radar gun at an oncoming vehicle. If the gun emits 9.0 x 109 Hz waves and detects waves 2000 Hz higher, what was the speed of the car?
Lesson9_Doppler Effect.notebook
6
October 21, 2013
Ex.2 A wavelength of 500 nm is seen as 530 nm when coming from a distant star. What is the speed of the star?
Lesson9_Doppler Effect.notebook
7
October 21, 2013
Red Shift or Blue Shift...?When a star approaches or moves away from us its light is seen as a slightly different frequency. This change in frequency is seen as a different color. This is called red or blue shift.
Red ShiftBlue Shift
short wavelength long wavelengthhigh f
low fapproaching receding
Lesson9_Doppler Effect.notebook
8
October 21, 2013
All major celestial bodies like galaxies, quasars and nebulae are red shifted so they are moving away from us.
http://www.youtube.com/watch?v=Y5KaeCZ_AaY
http://www.youtube.com/watch?v=Y5KaeCZ_AaY
Attachments
f18flyby.mpeg
FS14ss.mpeg
SMART Notebook
SMART Notebook
Page 1: May 27-3:01 PMPage 2: Apr 29-10:04 AMPage 3: May 27-2:41
PMPage 4: May 27-3:02 PMPage 5: May 27-3:28 PMPage 6: May 27-3:34
PMPage 7: May 27-3:35 PMPage 8: May 27-3:48 PMAttachments Page
1
![Simulation on Effect of Doppler shift in Fading channel ... · decreasing. This relationship is called Doppler Effect (or Doppler Shift) [5]. The Doppler Effect causes the received](https://img.pdfslide.us/doc/110x75/5ed8a45c6714ca7f47684d81/simulation-on-effect-of-doppler-shift-in-fading-channel-decreasing-this-relationship.jpg)
