JEE Main · 2024 · 01 Feb 2024 · Shift 1 · Elasticity & SHM

With rise in temperature, the Young's modulus of elasticity

(A)changes erratically
(B)decreases✓ Correct
(C)increases
(D)remains unchanged

Answer: (B)

Solution

Young's modulus measures a material's resistance to elastic (tensile/compressive) strain, which depends on interatomic bonding strength. As temperature rises, thermal agitation increases the average interatomic spacing and weakens the restoring force per unit strain, so the material becomes more easily deformed. Hence Young's modulus decreases with rise in temperature.

JEE Main · 2024 · 01 Feb 2024 · Shift 1 · Single correct option

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