light travells3,00,000 km/s. is it velocity or speed?
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It is speed. As in velocity, the direction of the movement is also mentioned.
∴ The speed of light is 300,000 km/s.
ThePhoenix:
and black holes' gravity is so strong light cannot escape. Light which is passing at a considerable distance bends
Try to make ur concepts crystal clear... Light travels in a straight line path as far as it is in the same medium... Bending takes place at the interface of two media due to change in VELOCITY of light...
black holes?
*nudge* *nudge*
Light travels in a straight line path as far as it is in the same medium... U r not getting it properly... That is why I mentioned we can call it both speed and velocity... U ignored velocity...
If light enters any substance with a higher refractive index (such as from air into glass) it slows down. The light bends towards the normal line. If light travels enters into a substance with a lower refractive index (such as from water into air) it speeds up. The light bends away from the normal line.
Any physics student knows that light travels in a straight line. But now researchers have shown that light can also travel in a curve, without any external influence. The effect is actually an optical illusion, although the researchers say it could have practical uses such as moving objects with light from afar.
It's well known that light bends. When light rays pass from air into water, for instance, they take a sharp turn; that's why a stick dipped in a pond appears to tilt toward the surface. Out in space, light rays passing near very massive objects such as stars are seen to travel in curves. In each instance, light-bending has an external cause: For water, it is a change in an optical property called the refractive index, and for stars, it is the warping nature of gravity.
http://www.sciencemag.org/news/2012/04/light-bends-itself
Dear, without any external influence... it is impossible... N yeh may be... it might be right to some extent... Rectilinear propagation still exists and that is why I am saying u can use both speed as well as velocity for light...
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Answer:
The correct answer is speed.
Explanation:
- Since light does not always travel in the same direction and hence does not always travel at the same speed, we refer to this speed as the speed of light.
- One universal physical constant that is significant in many branches of physics is the speed of light in a vacuum, typically abbreviated as c.
- The precise figure is 299792458 metres per second.
- Velocity is the pace and direction of an object's movement, whereas speed is the rate at which an object is travelling along a path.
- In other words, velocity is a vector, whereas speed is a scalar value.
Light has a speed of 3.0 *10^8 m/s in a vacuum.
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