Physics

Addition of suitable impurities into semiconductor, is called doping.

Stephen Hawking gave black hole theory.

Light houses are places with powerful lights to guide and warn the ships coming from different directions in the ocean.

The nature of fuse wire is high resistance and low melting point.

‘Mirage’ is an example of refraction and total internal reflection of light.

Frequency = velocity/wavelength_x000D_ = 500/4_x000D_ = 125_x000D_ Time period = 1/Frequency_x000D_ = 1/125_x000D_ = 0.008

The axe head and the doorstop are both examples of a wedge, a type of simple machine. It also acts as a type of lever.

The sensation of weightlessness in a spacecraft in an orbit is due to the acceleration in the orbit which is equal to the acceleration due to gravity outside.

In this case the given equation shows that that the velocity is linear with time and therefore the particle is moving with constant acceleration because for a particle to acquire constant acceleration the graph of the velocity time graph should be in linear with the time function.

The substances which lose their resistance completely at very low temperature are called Superconductors.