Speed of Light: Constant or Not?

Context: Undergrad
Thread starter adjacent
Start date Apr 21, 2013
Tags

Constant Light Speed Speed of light

Join the discussion

Registration is free. Ask a follow-up in this thread, or start your own.

2 replies · 1K views

adjacent

Gold Member

Thread starter
Apr 21, 2013

How can one say that speed of light is constant.Is there any possibilities of speeds greater the c.If Yes/no then why?

Discussion

Physics news on Phys.org

Laser-cut aluminum foil could replace costly terahertz polarizers
Realistic solid-state model brings fractons in quantum spin liquids closer to detection
LHC collisions reveal oxygen and neon's shifting nuclear geometry

russ_watters

Mentor

Insights Author

Apr 21, 2013

1. It's been measured. Lots of times.
2. Not for ordinary matter. There are some hypothetical exotic particles that may exceed C though.

adjacent

Gold Member

Apr 21, 2013

Thank you russ_watters

Speed of Light: Constant or Not?

Discussion

Undergrad Why is gravity a fictitious force?

Undergrad Why is 0.9g more efficient than 1.5g to Tau Ceti in Project Hail Mary?

Undergrad KE of rotating disc

Graduate How valid is the Block Universe theory?

Undergrad Why is the Lorentz Force always perpendicular to velocity?

Undergrad An alternative derivation of the equation of motion in General Relativity

Undergrad Is the weak field limit valid for the Brans-Dicke scalar field?

Graduate Energy-to-angular momentum ratio in EM v. gravity quadrupole radiation

Insights Revisiting the Velocity-Time Function

Insights Remote Operated Gate Control System

Insights AI Enriched Problem Solving

Insights Thinking Outside The Box Versus Knowing What’s In The Box

Insights Why Entangled Photon-Polarization Qubits Violate Bell’s Inequality

Insights Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect

Speed of Light: Constant or Not?

Discussion

Similar threads

Undergrad Proving speed of light constant “c” is the same in all directions?

Undergrad Doppler Effect on Light: Constant Speed of Light Confusion

High School Why is the speed of light constant for all observers?

High School Is the speed of light constant throughout the galaxy?

High School Is the speed of light constant to all observers?

High School Why is the constant speed of light so unique?

Undergrad I want a good reference to a discussion of the meaning of "the speed of light is constant"

Undergrad Exact historical explanation of deducing speed of light constancy

Undergrad Standing light waves if the one-way speed of light were not constant?

Undergrad Why is speed of light constant in all frames of reference?