December 6, 2023

Imagine a wire to be suspended from a rigid support and carrying a hanger on which suitable weights could be placed to study the behaviour of the wire under conditions of different loads. The extensions of the wire are suitably measured and thus stress and strain for the given wire is calculated. Now, if we

English Physicist Robert Hook in the year 1676 put forward the relation between the extension produced in a wire and the restoring force developed in it. The law formulated on the basis of this study is known as Hooke’s law. According to Hooke’s law, within the elastic limit, the stress developed is directly proportional on

Consider a cubic crystal of lattice constant ‘a’. The density of the crystal = ρ Volume of the unit cell = a³ Eqn 1 Mass in each unit cell = ρa³ [latex] \left(\because \text { Density }=\frac{\text { Mass }}{\text { Volume }}\right) [/latex] The number of atoms per unit cell = n The atomic