Physics Quiz 5

Shorter waves move faster and have more energy, and longer waves travel more slowly and have less energy.

Energy of Ultraviolet rays is greater than Infrared rays. Radio waves have photons with the lowest energies. Microwaves have a little more energy than radio waves. Infrared has still more, followed by visible, ultraviolet, X-rays and gamma rays. Cosmic rays are (not part of the electromagnetic spectrum) high-energy outer space particles.

The principle involved in a refrigerator is the rapid absorption of heat by the rapid evaporation of a volatile liquid. Refrigerators use a liquid that evaporates very easily, and this evaporation creates a cooling effect. They then compress the gas into a liquid again, and the whole process starts over.

A colour-blind person cannot distinguish between certain colours. Colour blindness often happens when someone cannot distinguish between certain colours. This usually happens between greens and reds, and occasionally blues.

If the force is held constant the pressure is inversely proportional to the area (Pressure = force/area). Here area of the nail is much greater than the area of the needle. Thus, needle exerts more pressure than nail on the balloon.

In a rechargeable cell, chemical energy is stored within the cell. Chemical energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of chemical energy.

A nano particle is an ultra fine unit with dimensions measured in nano metres (1 nm = 10⁻⁹ metre).

When warm air (over the fire spot) rises, the air pressure at that place gets lowered. But around it, pressure is high so the air rushes from high-pressure zone to low-pressure zone giving an appearance of fanning the fire.

Ice is packed in sawdust because it is a poor conductor of heat. The air filled in the fine pores of sawdust is an insulator of heat. This air does not allow heat from outside to pass to the ice thereby preventing its melting.

A concave lens is used to minimize the proportions of the objects and gives a wider view of the object or area. It always forms virtual, erect and diminished image.