1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jok3333 [9.3K]
3 years ago
5

Within the theory of G relativity what, exactly, is meant by " the speed of light WITHIN A VACUUM" ? & what does that have t

o do with the FIRST part of the theory / equation? How do they relate?
Physics
1 answer:
Ber [7]3 years ago
3 0
The speed of light "within a vacuum" refers to the speed of electromagnetic radiation propagating in empty space, in the complete absence of matter.  This is an important distinction because light travels slower in material media and the theory of relativity is concerned with the speed only in vacuum.  In fact, the theory of relativity and the "speed of light" actually have nothing to do with light at all.  The theory deals primarily with the relation between space and time and weaves them into an overarching structure called spacetime.  So where does the "speed of light" fit into this?  It turns out that in order to talk about space and time as different components of the same thing (spacetime) they must have the same units.  That is, to get space (meters) and time (seconds) into similar units, there has to be a conversion factor.  This turns out to be a velocity.  Note that multiplying time by a velocity gives a unit conversion of
seconds \times  \frac{meters}{seconds} =meters
This is why we can talk about lightyears.  It's not a unit of time, but distance light travels in a year.  We are now free to define distance as a unit of time because we have a way to convert them.  
As it turns out light is not special in that it gets to travel faster than anything else.  Firstly, other things travel that fast too (gravity and information to name two).  But NO events or information can travel faster than this.  Not because they are not allowed to beat light to the finish line---remember my claim that light has nothing to do with it.  It's because this speed (called "c") converts space and time.  A speed greater than c isn't unobtainable---it simply does not exist.  Period.  Just like I can't travel 10 meters without actually moving 10 meters, I cannot travel 10 meters without also "traveling" at least about 33 nanoseconds (about the time it takes light to get 10 meters)  There is simply no way to get there in less time, anymore than there is a way to walk 10 meters by only walking 5.  
We don't see this in our daily life because it is not obvious that space and time are intertwined this way.  This is a result of our lives spent at such slow speeds relative to the things around us.
This is the fundamental part to the Special Theory of Relativity (what you called the "FIRST" part of the theory)  Here is where Einstein laid out the idea of spacetime and the idea that events (information) itself propagates at a fixed speed that, unlike light, does not slow down in any medium.  The idea that what is happening "now" for you is not the same thing as what is "now" for distant observers or observers that are moving relative to you.  It's also where he proposed of a conversion factor between space and time, which turned out to be the speed of light in vacuum.
You might be interested in
I forgot to write also put drawings on my theory questions
11Alexandr11 [23.1K]
Hi love hope you had an amazing day! you’re beautiful!!
8 0
3 years ago
The force of Earths gravity keeps earth in orbit true or false
faust18 [17]

Answer:

<u>True</u><u> </u>

Explanation:

The force of gravity keeps all of the planets in orbit around the sun

8 0
3 years ago
Someone please help me with these questions! (The ones in the picture) Please I am super confused!
lozanna [386]

Answer:

c-d

Explanation:

3 0
2 years ago
Block mountains are caused by faults in the crust, where rocks can move past each other in a rift and rise. The uplifted blocks
ruslelena [56]
Simple the answers is A
8 0
3 years ago
Read 2 more answers
GIVING BRAINLIEST FIVE STARS AND HEART!
alina1380 [7]

Answer:

A bicycle on the top of the hill has the highest potential energy, and when the bike goes down, it transfers to kinetic because it is moving

Explanation:

yeah

4 0
2 years ago
Other questions:
  • 4 meters and the frequency is 3 hz what’s the wave speed
    5·2 answers
  • Please need help for this one
    12·1 answer
  • Match one of the numbers with one of the letters. Thanks!!!!!!!!
    6·1 answer
  • 40 POINTS!!
    10·2 answers
  • A raised plaster cover (often called a plaster ring or mud ring) is permitted to increase the maximum number of conductors permi
    13·1 answer
  • Why isn't earth overcrowded with animals
    9·1 answer
  • QUESTION 7
    6·2 answers
  • What was the main cause of the shift to a postindustrial society?
    9·1 answer
  • It is possible for an excited hydrogen atom to return to the ground state by the emission of a single photon. regardless of the
    14·1 answer
  • The efficiency of a canot engine is more when the temperature of the sink is increased by 50%
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!