Is the Speed of Light Absolute or Relative in Special Theory of Relativity?

In summary, According to the Special Theory of Relativity, nothing is absolute in this universe, but rather relative to each other. This means that the speed of light, as explained by Einstein, is a constant relative to any inertial observer. This means that while it may appear to be the maximum speed in one reference frame, it could be different in another. However, in both special and general relativity, the locally measured speed of light remains constant for all observers.
  • #1
astro2cosmos
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According to Special Theory of Relativity nothing is absolute in this universe, but relative to each other. as we know that Einstein told me that speed of light is max. Now I'm little bit confuse if speed of light is absolute or relative i.e it may be max. for initial reference frame but for any other frame it may/should be change from the value of 3 X 108 m/s. can anyone give me the reason for this.
 
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  • #2
astro2cosmos said:
According to Special Theory of Relativity nothing is absolute in this universe, but relative to each other.
That is not correct at all. There are many things which are absolute in SR. E.g. the spacetime interval, proper time, mass, the norm of the 4-acceleration, etc.
 
  • #3
And it is probably more correct to say that the speed of light is a constant, not an "absolute" or a relative thing. Ie, it is a constant relative to any inertial observer.
 
  • #4
russ_watters said:
And it is probably more correct to say that the speed of light is a constant, not an "absolute" or a relative thing. Ie, it is a constant relative to any inertial observer.

Actually the locally measured speed of light is constant relative to any observer, inertial or not, in both special and general relativity.
 

1. What is the difference between absolute and relative time?

Absolute time refers to the exact measurement of time based on a specific reference point, such as the atomic clock. It is the same for everyone, regardless of their location or perception. Relative time, on the other hand, is the measurement of time based on one's perception or experience. It can vary from person to person or based on different circumstances.

2. Can absolute time be manipulated or changed?

No, absolute time is a constant measurement of time that cannot be manipulated or changed. It is based on natural phenomena, such as the Earth's rotation and atomic decay, which are not affected by human actions.

3. Is relative time subjective?

Yes, relative time is subjective and can vary depending on one's perception or experience. For example, time may feel like it is passing quickly when we are having fun, but it may feel slow when we are bored.

4. How do scientists measure absolute time?

Scientists use highly accurate methods, such as atomic clocks, to measure absolute time. These clocks measure time based on the vibrations of atoms, which are incredibly consistent and reliable.

5. Can relative time be standardized?

No, relative time is based on individual perception and cannot be standardized. However, scientists have developed methods, such as the International Atomic Time, which uses the average of many atomic clocks to create a highly accurate and consistent reference for relative time measurement.

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