Physics

In general, the intensity of a wave is proportional to the square of its amplitude. This has an important implication: relative intensity can be obtained by squaring relative amplitude._x000D_ I α a_x000D_ So if the intensity ratio is 25:9, the amplitude ratio will be 5:3.

A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. In general, it’s main function is to convert kinetic friction into rolling friction. It achieves this by using at least two races to contain the balls and transmit the loads through the balls.

Coolidge tube is used to produce X-ray.

The speed of all the electromagnetic radiation are always same and equal to the numerical value 3 x 10 m/sec.

Metals are good conductors of electricity because they contain free electrons.