Hi(adsbygoogle = window.adsbygoogle || []).push({});

I have some very basic doubts on spacetime diagrams.

Please refer the figure attached.

Here in this spacetime figure an event E is shown as observed from K and K'.

K' moves with v with respect to K.

The axis CT is tilted angle alpha following vt, so that any event that occurs at x' = 0 in K' would occur at x = vt in K.

For frame K, to find space coordinate of the event, draw a perpendicular to x-axis.

But to find time coordinate draw a perpendicular to CT. why??

I dont get this and moreover the length of perpendicular gives x'??

Please explain

Abhishek Jain

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Spacetime diagrams.

**Physics Forums | Science Articles, Homework Help, Discussion**