Physics

Tungsten is used in electric bulb because it has high melting point and it does not oxidize. Thus tungsten filament does not melt even when a large amount of heat is produced due to passage of current through the filament (via heating effect of current).

Convex mirrors are used as side view mirrors in a car to see the traffic behind. This is because of the following reasons: The image formed in a convex mirror is highly diminished due to which a convex mirror gives a wide field of view of the traffic behind the vehicle.

A convex mirror bends light as it reflects the light, and the farther away a point is from the center, the more the light is bent. As a result, an image formed in a convex mirror is smaller than an image in a plane (flat) mirror.

Alpha is the least penetrating, while gamma is the most penetrating.

The energy stored in the nucleus of an atom is called nuclear energy. It is the energy that holds the nucleus together, and it is released when the nucleus splits or combines with another nucleus. Nuclear energy is a very powerful form of energy, and it can be used to generate electricity, create nuclear weapons, and power spacecraft.

An electrical fuse is a safety device in the circuit that protects electrical systems by breaking the connection when a short circuit is occurring. The fuse wire is made up of Sn (tin) and Pb (lead) alloy because of its high resistance and low melting point.

An atom bomb is based upon the principle of nuclear fission, which is the splitting of an atom’s nucleus. When an atom’s nucleus is split, it releases a large amount of energy. This energy can be used to create a powerful explosion.