9.4 Read the following two statements below carefully and state, with reasons, if it is true or false.
(a) The Young’s modulus of rubber is greater than that of steel;
(b) The stretching of a coil is determined by its shear modulus.
9a) The strain in rubber is more than that in steel for a given stress.
For the same stress:
Hence, Young’s modulus for rubber is less than that for steel.
(b) The ratio of the applied stress to the change in the shape of a body is known as the shear modulus.
The stretching of a coil changes its shape. Hence, shear modulus determines the elasticity of the coil in this process.
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