Physics

When the body is thrown vertically upwards, its acceleration will remain constant._x000D_ While its speed will become zero at the peak of its projection and thus kinetic energy changes.

When two semiconductor of p-type and n- type are brought in contact, they form p-n junction which act like a rectifier.

In a magnetic field, the direction of motion of a current carrying conductor is given by Flemings left hand rule.

Rocket works on the principle of conservation of momentum. Rocket ejaculates gases in backward direction which creates momentum of the gases backwards and thus by conservation of momentum, the rocket gets a momentum in the forward direction making it to move forward.

In 1929, Edwin Hubble, an astronomer at Caltech, made a critical discovery that soon led to scientific answers for these questions: he discovered that the universe is expanding.

To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor should be made of a good conductor like copper with sharp-pointed edges.

Hysteresis is found only in ferromagnetic materials.

Mirage is due to unequal heating of different parts of the atmosphere.

If lift is going up with acceleration, the apparent weight of a body is more than the true weight.

X-rays are part of the electromagnetic spectrum, an ionizing radiation with wavelengths shorter than ultraviolet light. X-ray tubes evolved from experimental Crookes tubes with which X-rays were first discovered in the late 19th century, and the availability of this controllable source of X-rays created the field of radiography, the imaging of opaque objects with penetrating radiation.