## What is the speed of light of a headlamp of a plane travelling at a speed of 1000km/s

Is it same as 'c'?
or is it greater (though it may be very small difference) than the normal
speed of light?
 PhysOrg.com physics news on PhysOrg.com >> Study provides better understanding of water's freezing behavior at nanoscale>> Soft matter offers new ways to study how ordered materials arrange themselves>> Making quantum encryption practical
 Recognitions: Gold Member The speed of light is 'c' no matter how fast an observer is going. That's one of the guiding principals behind special relativity.

 Quote by aby001234 Is it same as 'c'? or is it greater (though it may be very small difference) than the normal speed of light?
Passengers aboard airplane measure it as 300,000km/s (c).
Onlookers on Earth on measure it as 300,000km/s (c).
Aliens passing by overhead at .9c measure it as 300,000km/s (c).

## What is the speed of light of a headlamp of a plane travelling at a speed of 1000km/s

 the speed of light comes from the solution to wave equation for E and B fields. And then number is constant.