Which of the following affects the elasticity of a substance

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hammering and annealing

change in temperature

impurity in substance

all of these

answer is D.

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Detailed Solution

Temperature affects elastic properties.
Also, impurities affect elasticity by strengthening the bonding between crystal grains, which increases elasticity.
The structure of the material is altered by hammering as crystal grains fragment into smaller units, which significantly affects the material's flexibility (increases elasticity).
Annealing has the tendency to produce larger crystals and alter elasticity by forming crystal grains with a consistent orientation.

Hence the correct answer is all of these.

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