Physics Quiz 5

The total energy of an electron in an atom in an orbit is −3.4eV. The total energy is the sum of the electron's kinetic energy (3.4 eV) and the potential energy (-6.8 eV) coming from the electron-proton interaction.

A battery is a DC voltage source that converts chemical energy to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit.

A communications satellite's transponder is the series of interconnected units that form a communications channel between the receiving and the transmitting antennas. It is mainly used in communication satellite to receives signals from an earth station and transmits them to different directions.

In solar cookers, sunlight is converted to thermal energy. Infrared rays are responsible for the working of the solar cooker. Infrared radiation has the right energy to make the water, fat and protein molecules in food vibrate vigorously and heat up.

A cryogenic rocket engine is a rocket engine that uses a cryogenic fuel and oxidizer; that is, both its fuel and oxidizer are gases which have been liquefied and are stored at very low temperatures.

An integrated circuit (IC) is a set of electronic circuits on one small flat piece of semiconductor material, usually silicon. IC can function as an amplifier, oscillator, timer, microprocessor, or even computer memory.

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.

When Rays from a distant point source travel parallel to each other in a particular direction, it forms a parallel Light Beam. The sun-ray is an example of a parallel Beam of Light.

Battery acid is sulphuric acid that has been diluted with water to attain a 30-40% concentration level.

Complementary colours are pairs of colours which, when combined or mixed, cancel each other out by producing white or black. Examples of complementary colour combinations are: Red and green; yellow and blue (purple).