When light traveling through the air enters a different medium, such as glass or water, the speed and wavelength of light are reduced, although the frequency remains unaltered. Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water and 200,000 kilometers per second in glass . In diamond, with a rather high refractive index of 2.4, the speed of light is reduced to a relative crawl (125,000 kilometers per second), being about 60 percent less than its maximum speed in a vacuum.
@RavinduNanayakkara2 жыл бұрын
That's because unlike a vacuum, the photon particles that make up the ray of light keeps interacting and bouncing around the atoms of the medium it's travelling in, resulting in the refraction and the slowdown to an observer. But the photons themselves maintain the speed of light regardless of the medium. In a vacuum, the speed of the photons and the speed of the resulting light is the same because photons aren't interacting with any atoms.
Thank you very much for the great explanation! I have a question.. Let’s say a person who travels on a train and he sees a tree outside. He can perceive the motion in two different ways.. he can say he’s moving at a speed of x and the tree is stationery. Or he can say the tree is moving away from him at a speed of x and he’s stationery. So in the latter perception, if we replace the man and the tree with the light clocks. From the point of the moving clock, the stationery clock is actually perceived as travelling at an x speed. So in that case the stationery one is actually ticking slower than the moving one in that scenario. Also a third person who travels in between these two clocks in a speed of x/2 will see the clocks moving apart from each other in a constant speed. And both clock light pulses travel an equal distance.. this is a bit confusing 🙁 I would appreciate if you could explain this 🙏🏼
Bohoma sthuthy obathumata.thawath vedio 1k karanna puluwannm godak kamathy meganama.thank u so much..
@thewhitesaucecompany2 жыл бұрын
Warp drive is a concept of space traveling which uses space time dilation influenced by gravity. If we can artificially bend this space-time matrix, we would be able to achieve near light speed for a certain extent. Perfect explanation sir. Thank you. Sir did you learn at D.S Senanayake Collage, Colombo???
@@ScienceWithRuchira 13:28 Sir, is it correct to tell "when speed is constant and distance is increasing then time is decreasing according to the equation speed = distance/time. When we formulate this equation as speed × time = distance, then when the speed is constant ,time should be directly proportional to distance.
මටත් තියෙන ප්රශ්නේ තමයි ඔය කියන big ban theory එක ට පෙර විශ්වය නොතිබුණු තැන කුමක් ද ?
@zorrow-attentiontoreaction35502 жыл бұрын
FOLLOW BUDDISM
@sumithhewage2913 ай бұрын
Eta kalin thibuneth thawath wishwayak wanna barida? Eka yamkisi akarayakin ek laksheyakata sankochanaya wela big bang una wenna barida? Eka hethu phala nyayatath ekangai.
@@gayanudarasampath6654 na na ethakota thamay vegaya niyatha venne.
@gayanudarasampath66542 жыл бұрын
@@bloodasssassin5122 C=S/t Suppose C=4 that is the constant then 4(C)=8(S)/2(t) if s goes up as sir's explanation 4(C)=16(S)/t , tsould be 8 , thet mean when distance increase time should goes up. Hope you can understand now
@bloodasssassin51222 жыл бұрын
@@gayanudarasampath6654 Why time decreases with increase in velocity? Velocity=displacement/time so, If the displacement is constant then the velocity is inversely proportional to time so increase in velocity with decreases in time. Ex:- 1) v=2,d=8,t=4 Here in above example the velocity is 2m/s displacement is fixed and it is 8m, and time is 4sec. Now, If we increase the velocity then time will be decreases. 2) v=4m/s,d=8m,t=2sec This way the time and velocity is inversely proportional to each other when the displacement remains constant. Hope you can understand this now too