Physics

Sunlight is the both renewable and inexpensive resource from the given options.

A spring is an example of Hooke’s law.

X-rays region lies between gamma rays and ultraviolet region.

Frequency is the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency.

The resistance decreases with increase in temperature for nichrome.

It is a result of unstable atoms that are trying to stabilize. The excess energy is released as gamma particles. However, lead, steel and concrete reduce the energy of these particles and hence stop their penetrating abilities.

Holography is a photographic technique that records the light scattered from an object, and then presents it in a way that appears three-dimensional.

In physics, the dynamo theory proposes a mechanism by which a celestial body such as Earth or a star generates a magnetic field._x000D_ Earth’s crust core contains a large amount of iron and nickel is the evidence of the dynamo theory.

Momentum is conserved in all types of collision whether it is elastic or inelastic where as kinetic energy is lost in sound energy in the absence of external force in inelastic collision.

Refrigeration is the process by which artificial cooling takes place. The temperature is kept lower than the normal during the process. It stops the growth of the bacteria thereby keeping the food perishable and edible.