Physics Quiz 6

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.

All nuclear power plants use nuclear fission, and most nuclear power plants use uranium atoms. During nuclear fission, a neutron collides with a uranium atom and splits it, releasing a large amount of energy in the form of heat and radiation.

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.

By lowering his hands while catching the cricket ball, the player allows a longer time for momentum change (lower the momentum), thereby preventing his hands from getting injured.

A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 km directly over the equator, that revolves in the same direction the earth rotates (west to east). At this altitude, one orbit takes 24 hours, the same length of time as the earth requires to rotate once on its axis. So they seem stationary, relative to the Earth's surface.

The Special Theory of Relativity is based on Einstein's recognition that the speed of light does not change even when the source of the light moves.

As altitude increases and atmospheric pressure decreases, the boiling point of water decreases. To compensate for the lower boiling point of water, the cooking time must be increased. Turning up the heat will not help cook food faster.

The melting point increases with an increase in pressure except for ice. The melting point of ice decreases when pressure increases. This strange behaviour of the ice is observed because water expands when it freezes i.e. ice occupies more volume than liquid water.

The time period of a pendulum is directly proportional to the square root of its length. So when its length is halved, its time period is decreased by a factor. If the length L of a simple pendulum is halved, then its period of oscillation will decrease by √2÷2.

Electron microscopes are used to investigate the ultrastructure of a wide range of biological and inorganic specimens including microorganisms, cells, large molecules, structure of bacteria and viruses, etc.