Science

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How fast does the light travel?

The speed of light is the fastest speed known- light travels through the vacuum of space at 300,000 km per second. Nothing else can travel at this speed, and the theory of relavity, conceived by Albert Einstein, says that nothing can even approach this speed. This means that travel to the stars will not be possible, because it would take hundreds of years to reach them.

How can light travel along a cable?

Although light travels only in straight lines, it can be made to bend around curves and angles using optical fibres. These are bundles of very thin strands of exceptionally clear glass. The fibres are treated so that their outer surface reflects light. When light is shone in one end of the bundle it passes along the fibres, reflecting from the sides as they curve and eventually emerging at the far end.

Optical ffibres carry electronic signals to computers, and they are increasingly used in telephone lines. Optical fibres are very useful in medicine to diagnose disease. A flexible fibreoptic probe can be inserted into the body to view the internal workings of an organ.

What are magnets made of?

Permanent magnets are usually made from mixtures of iron, cobalt and nickel, but others contain far more complicated mixtures of metals. Magnetite is a natural magnetic substance, which used to be called lodestone. It is a material that contains iron, and it was originally used to make the first primitive compasses.

all credits to Ms. Belinda Gallagher(except the photo)