Physics Physics - Section 2

The density of pure water is 1000 kg/m³. Ocean water is more dense because of the salt in it. Density of ocean water at the sea surface is about 1027 kg/m³.

The process by which free electrons are emitted from the surface of a metal when external heat energy is applied is called thermionic emission. Thermionic emission occurs in metals that are heated to a very high temperature.

Salt water is denser than fresh, salt water provides more buoyancy there is even differences from the pacific ocean and the Atlantic

Static friction is greater than kinetic friction because of irregularities between the static object and the surface upon which it rests. The irregularities mesh together making it more difficult to start movement than to keep the object in motion

X-rays are electromagnetic waves with wavelength range 0.1 A-100 A.X-rays were discovered by Roentgen and X-rays travels in straight line.

When we rub hands, the mechanical energy due to friction between the hands is converted into heat energy

When water is lifted int an overhead tank using a motor, it converts electric energy to kinetic energy.

Green cellophane/glass will only allow green light to pass through it.

Respiration is the chemical reactions that take place within cells by which food is “burned” and converted into carbon dioxide and water.

When a bow with an arrow is stretched, the mechanical energy is converted into potential energy.