from postulate based modern physics to mechanism revealed physics

What is Physics? - The word 'Physics' comes from the Greek word 'phusis' meaning 'nature', introduced by the ancient scientist 'Aristotle'. Man has always been fascinated by nature. So, he questioned and sought answers for every phenomena nature could offer. The branch of scienc..

The development of telephone, telegraph and telex enables us to transmit messages instantly. The development of radio and television satellites has revolutionised the means of communication. Advances in electronics (computers, calculators and lasers) have greatly enriched the society. Ra..

The specific heat of a substance is the amount of heat required to increase the temperature of a unit mass of it through a unit temperature. Its units in cgs system are cal g -1 o C -1 . In mks system, it is measured in kilocal kg - 1 o C - 1 . The SI unit is J kg - 1 K - 1 . The above definition i..

Thermionic Emission - The emission of particles from a hot filament was first discovered by Thomas Edison in 1883 but the effect was left unexplained until the discovery of the electron by J.J. Thomson in 1897. In Edison's experiment, he inserted a second filament in the evacuated bulb of a carbon ..

Internal Energy - Internal energy is one of the most important concepts in thermodynamics. Energy changes in a body sliding with friction. Warming a body increases its internal energy and cooling the body decreases its internal energy. However, what is internal energy? We can look at it in various ..

>) and g the acceleration due to gravity (~10m/s 2 ). The pressure at the base should be less than the elastic limit of the Earth's supporting material (3 x 10 8 N/m 2 ) The stress vs strain for elastomers is a curve like this While using a material, it is ensured that the working stress ..

Bohr improved upon Rutherford model postulating that electrons can revolve around the nucleus in certain discrete, non-radiating orbits, called stationary orbits, for which total angular momentum of revolving electron is an integral multiple of h / 2 p where h is Planck's constant. Where ..

.e., facsimile of printed matter or pictures) use a similar mechanism. In the case of intercontinental telecommunication, two or more satellites are linked together. High frequency radio and submarine cable systems have been widely used for long- distance overseas telecommunications. The ..

This is spent during discharging of the condenser. In an LCR circuit, average power associated over a complete cycle is P = E u I v cosQ where Q is phase angle between alternating voltage and alternating current in the circuit, cosQ = p / E v I v = true power / apparent power, is called power facto..

. The wavelengths absorbed appear as dark lines or bands on a bright background. According to Kirchhoff's law an element can absorb only those wavelengths from continuous light, which it emits at the same temperature. This law was used to study structure of the Sun when Fraunhoffer explained existe..