Speed of Light: Expert Answers to Your Questions

  • Context: High School 
  • Thread starter Thread starter BDfarsi
  • Start date Start date
  • Tags Tags
    Light Speed
Click For Summary

Discussion Overview

The discussion revolves around the speed of light, its measurement, and its relationship to gravity, particularly in the context of black holes and the compatibility of quantum mechanics with relativity. Participants explore various aspects of these concepts, including definitions and implications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the exact speed of light, suggesting two different values and seeking clarification on the correct measurement.
  • Another participant provides the accepted speed of light as 299,792,458 m/s, noting the common approximation of 300,000 km/s.
  • There is a repeated inquiry about whether the speed of light is the same as the speed of gravity, with one participant asserting that disturbances in the gravitational field travel at the speed of light.
  • Concerns are raised about the nature of gravity and light near black holes, with one participant expressing confusion about how gravity can affect light and questioning the definition of distance and time in such extreme conditions.
  • A participant suggests that quantum mechanics and relativity may not be compatible, raising the question of a potential link between the two theories.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the relationship between the speed of light and gravity, with some agreeing that disturbances in gravity travel at light speed, while others remain confused about the implications of black holes on these concepts. The discussion does not reach a consensus on the compatibility of quantum mechanics and relativity.

Contextual Notes

There are limitations in the discussion regarding the definitions of speed, distance, and time, particularly in extreme gravitational fields like those near black holes. The relationship between quantum mechanics and relativity remains unresolved.

Who May Find This Useful

This discussion may be of interest to individuals exploring fundamental physics concepts, particularly those related to the speed of light, gravity, and the intersection of quantum mechanics and relativity.

BDfarsi
Messages
3
Reaction score
0
hello scientists!
Im new user. so I don't know manythings about physics.

one more thing:I don't know english well.

I just have a question about "Speed of light".
Whats the real speed of it?
300,000 k/h Or 300,000,000.001 m/h?

whats the rule of it?

The light's speed is the same as the gravity's speed?

What are your answers?
 
Last edited:
Physics news on Phys.org
BDfarsi said:
I just have a question about "Speed of light".
Whats the real speed of it?
300,000 k/h Or 300,000,000.001 k/h?
The speed of light is 299,792,458 m/s. (≈ 300,000 km per second, not per hour.)

See: http://en.wikipedia.org/wiki/Speed_of_light"
 
Last edited by a moderator:
thanks a lot.
I think its very important in our equation and i didnt know it!it was too bad!

another question:
The light's speed is the same as the gravity's speed?

I think gravity has a real speed and It can't be faster than light. so why the black holes can suction the light?

thanks for your help!
 
BDfarsi said:
another question:
The light's speed is the same as the gravity's speed?
Yes. A disturbance in the gravitational field is believed to travel at the speed of light.

I think gravity has a real speed and It can't be faster than light. so why the black holes can suction the light?
Spacetime around a black hole is so distorted it curves back onto itself. (I'm sure there are folks here who will give you a much more detailed answer, if you need one.)
 
Its so good!

So I can not interpret.
I think even the distance (eg time) in a black hole is not defined and strange.
Let alone the speed!

A very small object, which is related to quantum mechanics and high crime s that gets laws of relativity. These two are not compatible! Is there a link between them?
 

Similar threads

High School Let me ask a thing about the Speed of Light
  • · Replies 6 ·
Replies
6
Views
2K
High School Why is it impossible to go faster than the speed of light?
  • · Replies 21 ·
Replies
21
Views
5K
High School Would We See the Same Light After Traveling Back to Earth Faster Than Light?
  • · Replies 2 ·
Replies
2
Views
2K
High School Speed of light and this Accelerating Rocket scenario
  • · Replies 45 ·
2
Replies
45
Views
5K
High School Why does it require an infinite amount of energy to reach the speed of light?
  • · Replies 130 ·
5
Replies
130
Views
17K
High School Can Push Travel Faster Than Light?
  • · Replies 5 ·
Replies
5
Views
4K
High School Speed of Light: Questions Answered
  • · Replies 8 ·
Replies
8
Views
1K
High School Does Force Travel Faster Than Light?
  • · Replies 8 ·
Replies
8
Views
3K
High School Thought Experiment : Try and get Alice to "0%" the Speed of light
  • · Replies 15 ·
Replies
15
Views
2K
High School How does Einstein's equation work? Why do we need to square c?
  • · Replies 18 ·
Replies
18
Views
2K