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Redshift simulator

screenshot of the scene

Author: ivan

Group: Educational

Filesize: 417.81 kB

Date added: 2011-08-04

Rating: 6.1

Downloads: 1645

Views: 1011

Comments: 5

Ratings: 3

Times favored: 0

Made with: Algodoo v1.9.8b

Doppler effect

Scene tag

Here we have a metal box with a high resolution camera and a screen that shows the frequency of the light arriving at the camera (up left), the direction of motion relative to the star (up right) and type of radiation (bottom).

Redshift happens when light seen coming from an object is proportionally increased in wavelength, or shifted to the red end of the spectrum. More generally, where an observer detects electromagnetic radiation outside the visible spectrum, "redder" amounts to a technical shorthand for "increase in electromagnetic wavelength" which also implies lower frequency and photon energy in accord with, respectively, the wave and quantum theories of light.

Redshifts are attributable to the Doppler effect, familiar in the changes in the apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles; an observed redshift due to the Doppler effect occurs whenever a light source moves away from an observer. Cosmological redshift is seen due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase of their distance from Earth.

[Source: Wikipedia] [See more]

The speed of the box is limited to the range to see the yellow/orange star in near infrared to the speed that makes the star visible in near ultraviolet.
So, the max speed to the left is higher than the max speed to the right.
When the box is not accelerating, the thrusters are off, and the ostensible light frequency is constant.

Note that the actual speed of light in relation to the box should be always constant, not like shown in the simulation. So the simulation is not showing in a relativistic way how the things really are.

Please comment and rate.

Have phun!
Last edited at 2011/09/26 19:01:17 by ivan
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Very good explaination but not that accurate.:( When you go some distance away and stop moving, there shoud be no visible shift because redshift is due to acceleration, not distance. There's other bugs, but it's still good though. 9/10
@Mag8328 Redshift is caused by distance because of expansion of the universe as discovered by Hubble. The light source and observer are receding from each other even though both are stationary.
Last edited at 2011/08/04 17:34:46 by wild bill
The box accelerates while you are holding the arrow key. When you release the arrow key, you don't stop moving, you just have a constant speed.

Redshift in this simulation is due the speed, not acceleration or distance. So, the wavelength stays the same, but if we subtract the speed of the box from the speed of light, we get a ostensibly lower speed of light.

Thank you for your replies! I know for some bugs. It will be fixed.
Last edited at 2011/08/04 18:57:10 by ivan
Amazing _o_ 10/10
A very good redshift simulation:tup:
How do I make those waves and stuff?