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The blue colour of sky is due to the scattering of light by small particles of the atmosphere (air molecules) when the light is incident on particles whose size is smaller than the wavelength of light, it is scattered. According to Rayleigh law, the intensity of scattered light is inversely proportional to the fourth power [...]

Important Topics Tags: Why sky appears Blue ?, Why Sky is Blue ?

Electromagnetic waves are composed of oscillating electric and magnetic fields at right angles to each other and both are perpendicular to the direction of propagation of the wave. Electromagnetic waves differ in wavelength (or frequency). In  an electronegative wave the electric field E(vector) and the Magnetic field B(vector) oscillate perpendicular to each other and both [...]

Important Topics, Physics Tags: Electromagnetic Induction, Electromagnetic Radiations, Electromagnetic spectrum, Electromagnetic waves

Each orbital in an atom is specified by a set of three quantum numbers (n, ℓ, m) and each electron is designated by a set of four quantum numbers (n, ℓ, m and s).Principle quantum number (n) : It was proposed by Bohr and denoted by n.It determines the average distance between electron and nucleus, means it denotes the size of atom.

Chemistry, Important Topics Tags: Azimuthal quantum number, Magnetic quantum number, Principle quantum number, Quantum Numbers and Orbitals, Qunatum Numbers, Qunatum Numbers in Chemistry, Spin quantum numbers

(a + b)(a – b) = a2 – b2 (a + b + c)2 = a2 + b2 + c2 + 2(ab + bc + ca) (a ± b)2 = a2 + b2± 2ab (a + b + c + d)2 = a2 + b2 + c2 + d2 + 2(ab + ac + ad [...]

Important Topics, Mathematics Tags: Important Mathematical Formulae, Important Maths Equations

It is a device developed by Lawrence and Livingstone and is used to accelerate charged particles like protons and deuterons. This results in the production of high energy beam which is then used for artificial disintegration, etc.It consists of two D shaped metal boxes (about 21″ in diameter) with their straight sides facing each other.

Important Topics, Physics Tags: Cyclotron Frquency, Cyclotron in India, Cyclotron Motion, Cyclotron Principle, Cyclotron Resonance

Modulation is an important step of communication system. Modulation is defined as the process whereby some characteristic (line amplitude, frequency, phase of a high frequency signal wave (carrier wave) is varied in accordance with instantaneous value intensity of low frequency signal wave (modulating wave.)

Important Topics, Physics Tags: Amplitude Modulation(AM), Frequency Modulation(FM), Modulation Amplitude Modulation(AM) Frequency Modulation(FM) and Phase Modulation(PM)

  1) Rutherford carried out experiment on the bombardment of thin (10-4 mm) Au foil with high speed positively charged a- particles emitted from Ra and gave the following observations based on this experiment, (i) Most of the a- particles passed without any deflection. (ii) Some of them were deflected away from their path. (iii) [...]

Chemistry, Important Topics, Physics Tags: Rutherford Experiment, Rutherford Nuclear Model

In some cases for example, sulphides ores of copper, zinc and lead concentration is brought by this method. In this method advantage is taken of the referential wetting of the ore by an oil.The finely ground ore is taken in a tank containing water and 1% of pine oil or terpentine oil. A strong current [...]

Chemistry, Important Topics Tags: Froth Floatation Process, Froth Floatation Sulphide Ores

Yoga Yoga has been an integral part of Health and Physical Education that has been a compulsory subject up to the secondary school stage since 1988. The NCF 2005 adopted a holistic definition of health in which yoga is an integral part of it. Both yoga and physical education contribute to not merely the physical [...]

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Yoga in Schools Teacher Training Assistance may be given to Yoga Institutes for training regular teachers of Government and Government-aided schools in yoga in an integrated way. For those teachers, who would be teaching yoga though they are not yoga/health and physical education teachers may be required to undergo training for one month. Refresher courses [...]

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