Target SSB

Following Four Basic Forces operate in all natural processes : Gravitation Forces Weak Force Electromagnetic Force Strong Forces 1.  Gravitation  Forces : It is the force of attraction between two masses. It is always attractive in nature; hence sometimes it is taken with negative sign. It is a long range force, i.e., it can extend up to infinity. It follows inverse square  law  i.e., F ∞ 1 / r2. It is assumed to be created by a particle called gravitation. It is central force and hence, it is conservative in nature. It is the weakest force. 2. Weak Force in  Physics  : It is the force associated with beta – decay in radioactivity. During beta – decay, the following reaction takes place. 0 n 1 ⇒ β – + 1 P 1 + γ Neutron Beta Particle or Electron Proton Antineutrino Since, neutrino is a chargeless – massless particle, therefore during beta – decay, the  electron  and antineutrino interact with each other through very weak forces. Moreover, the leptons interact with Leptons, Baryons or Me

Chapter 1:  Chemical Reactions and Equations(Class 10th) 1. Chemical reaction: The reaction in which the original state of the particles changes and it cannot be reversed by simple physical means, is known as a chemical reaction. Examples: fermentation of grapes, burning of wood, etc. Burning of wood produces charcoal and we cannot get back wood from charcoal on reversing the conditions. ·         Chemical reaction is accompanied by change in state, colour, evolution of gas or change in temperature. The chemical reaction is represented as Reactants → Products ·         Example of a chemical reaction is burning of magnesium ribbon with a dazzling white flame to form a white powder (magnesium oxide). 2Mg + O 2  → 2MgO 2. Chemical equation: Representation of a chemical reaction in terms of chemical symbols and formulae of the reactants and products is known as chemical equation. A chemical equation represents the reactants, products and their physical states symbolically. For ex