^Mass defect
^Mass defect
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^Nuclear Force
^Nuclear Force It binds the nucleons together protons and neutrons together in the nucleus of an atom against the repulsion of positively charged protons. It is a is short range force & believed to be due to the exchange of pions (also called π – mesons) between the nucleons. It is the strongest (as Fg: […]
^Density of nucleus
^Density of nucleus Nuclear density is independent of Mass number.
^Nucleus
^Nucleus Scattering experiments using fast electrons (instead of α – particles) as projectiles on targets of various elements, the sizes of nuclei of various elements have been accurately measured to be R = R0 A1/3 Here R0 = 1.2 × 10 -15 m known as nuclear unit.
^Neutrons
^Neutrons 1. Neutron (discovered by James Chadwick in 1932) is an elementary particle present in the nuclei of all elements except hydrogen. 2. The mass of a neutron is slightly more than that of a proton & is now known to a high degree of accuracy. It is mn = 1.00866 u = 1.6749×10 –27 […]
^Nucleus of an atom
^Nucleus of an atom Large angle scattering of α-particles by thin metal foils in Rutherford’s experiment revealed 1. Nuclear size is found to be of the order of 10–14 m whereas the diameter of an atom is of the order of 10–10 Hence most of the atom is empty or nucleus of an atom is […]
^Painter’s chair
^Painter’s chair A person of mass M is standing in a box of mass m and pulling the same box with acceleration a by applying a force F as shown in the diagram. Let N is the force on man by box. System, FBD & Newton’s law Rope (massless): 0. a = T – F […]
^A horizontal push on three blocks
^A horizontal push on three blocks Three blocks in contact are pushed on a smooth horizontal surface with acceleration a w.r.t. to ground. The internal forces being equal & opposite cancel out in pairs for a complete system F = (m1 + m2 + m3) a For individual masses using NSL we have
^A horizontal pull on three blocks
^A horizontal pull on three blocks Using NSL, we can write System m1: m1 a = F – T12 System m2: m2 a = T12 – T23 System m3: m3 a = T23 System total mass: (m1 + m2 + m3) a = F
^Physical forces
^Physical forces Forces which are due to some kind of interaction are called physical force. e.g. gravitational, electromagnetic.
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