### Author Topic: Light cone (simulation)  (Read 46918 times)

#### Fu-Kwun Hwang

• Hero Member
• Posts: 3062
##### Light cone (simulation)
« on: May 28, 2009, 05:55:47 pm »
In special relativity, a light cone (or null cone) is the surface describing the temporal evolution of a flash of light in Minkowski spacetime. This can be visualized in 3-space if the two horizontal axes are chosen to be spatial dimensions, while the vertical axis is time.

Image from wiki: http://en.wikipedia.org/wiki/Light_cone

The following simulation was created to help you visualize the light cone (for observer moving with blue dot at the left X-Y panel). Events from three observers are drawed with blue, green and cyan traces.

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

#### ivanvii

• Newbie
• Posts: 1
##### Re: Light cone (simulation)
« Reply #1 on: December 07, 2010, 08:07:31 pm »
why alll simulations cant'r work although i got java?
i can play on line chess, alll games but can't wathch those simulations?
too shabby

#### ahmedelshfie

• Hero Member
• Posts: 930
##### Re: Light cone (simulation)
« Reply #2 on: December 07, 2010, 08:43:34 pm »
You have to be sure that already have java in your PC to be able run all simulation,
Try again and use more than one browser.

« Last Edit: December 07, 2010, 08:49:41 pm by ahmedelshfie »

#### amanda87

• Newbie
• Posts: 2
##### Re: Light cone (simulation)
« Reply #3 on: November 16, 2011, 04:22:52 pm »
why alll simulations cant'r work although i got java?
i can play on line chess, alll games but can't wathch those simulations?
too shabby

I can't run the simulation too. Is there any other way to watch it?

#### ahmedelshfie

• Hero Member
• Posts: 930
##### Re: Light cone (simulation)
« Reply #4 on: November 16, 2011, 05:20:16 pm »
To you can watch simulations at you PC you should be already install JDK(Java run time) you can found at Java SE Development Kit 7 Downloads
Later when finish download you have too install and Enjoy the physics applets.

#### amanda87

• Newbie
• Posts: 2
##### Re: Light cone (simulation)
« Reply #5 on: November 18, 2011, 05:03:28 am »
Now everything is OK, thank you!!!