How Can Tom Calculate Time Dilation and TV Transmission in Special Relativity?

Click For Summary

Homework Help Overview

The discussion revolves around a problem in special relativity involving time dilation and the transmission of television signals as experienced by an astronaut named Tom (or Astrid) traveling at a significant fraction of the speed of light. The problem includes calculating the time elapsed on Earth during the astronaut's journey and understanding the implications of relativistic effects on the perception of time and events.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the astronaut's journey, including the time elapsed on Earth and the implications of watching a live television broadcast from a distance. Questions are raised about the calculations for parts (b) and (c) of the problem, with some participants seeking clarification on the astronaut's distance from Earth and the corresponding year during the journey.

Discussion Status

Some participants have provided answers to part (a) of the problem, while others are exploring the implications of the astronaut's distance and the timing of events on Earth. There is an ongoing exchange of ideas regarding how to approach parts (b) and (c), with participants seeking further clarification and guidance on the concepts involved.

Contextual Notes

Participants are navigating the complexities of special relativity, including time dilation and the effects of traveling at relativistic speeds. There is mention of a spacetime diagram and the need for further explanation regarding the transmission of television signals over vast distances.

alizeid
Messages
14
Reaction score
0
Hi!

I have difficulty with the English language but will try my best. I have recently begun to study the theory of special relativity. , I understand what the relativity of time is, relativity of length and Lorentz transformations. But I still have difficulty with solving data and do not know how I should think. I am grateful if anyone can help me. Let me give an example;On New Year's Day 2500 gives the astronaut Tom off exploring in the expanse. He takes off with speed 0,6c. After four years of traveling away from the Earth (according to him), she witnesses a live television broadcast of the New Year celebrations on earth. This did her to begin long for home. She turns the spaceship and steer back toward Earth with the same speed as before, and is home for another four years.

a) How much time has elapsed on Earth during her absence?

b) What is the New Year celebration was Astrid watched on TV before she turned?

c) During the entire trip home sits Astrid front of the TV and giggle when she witnesses the continuous direct broadcast television programs from the earth. How many times quickly moves everything on Astrid's telescreen during her journey home?

I can solve A without any problem and get the right answer but then I want to solve b and c, it becomes total blockage in the brain, a complete misfit. I do not know how to think. Can anyone help me with how to do and think? what steps need to be understood and what is actually happens. I have no ide how to solve b and c. I'am very grateful if someone can help me. Thanking you in advance!
 
Physics news on Phys.org
Can you show the answer you got for (A)?

How far away was Tom/Astrid when he/she turned around, and which year was on Earth then (as seen from earth)?
Did you draw a spacetime diagram?
 
The solution for a is 10 years. How I came up with this, You can take a look to the picture below.

"How far away was Tom/Astrid when he/she turned around, and which year was on Earth then (as seen from earth)?"

the answer is as seen from earth, she is 3 lightyears away from the Earth and and it took five years.
 

Attachments

  • rel1.JPG
    rel1.JPG
    3.6 KB · Views: 405
If Astrid is 3 light years away in the year 2505, which new year celebration can she see?
Based on that, she saw X years of television in 4 years. This also allows to answer (c) for one direction, the other direction works in the same way.
 
sorry, can you explain more. i can't get it:-(
 
How long did the TV transmission travel to reach the point in a distance of 3 light years?
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 21 ·
Replies
21
Views
6K
  • · Replies 9 ·
Replies
9
Views
2K
Replies
18
Views
5K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
Replies
11
Views
4K