Physics

Infrasonic Sound has a frequency less than the audible frequency range. Frequencies are less than 20 Hz. The infrasonic sounds have below the lower limit of human hearing.

The sum total of the potential energy and the kinetic energy of the object during its free fall remains the same, i.e., the total mechanical energy (potential energy + kinetic energy) remains constant. Thus, the law of conservation of energy is not violated.

Water is used as a coolant in automobiles radiators because it has high specific heat capacity. So, it absorbs a large amount of heat for a degree rise in temperature.

A transformer is used to decrease or increase AC voltage.

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.

For safety, the fuse wire used in the mains for household supply of electricity must be made of metal having low melting point.

Particle physics studies the nature of particles, while nuclear physics studies the atomic nuclei.

The alternative energy source which is exhaustible is geothermal energy.