JEE Main20254 Apr 2025Evening ShiftPhysicsThermal Properties of MatterActual
Consider a rectangular sheet of solid material of length =9 ~cm and width d =4 ~cm . The coefficient of linear expansion is =3.1 10⁻⁵ ~K ⁻¹ at room temperature and one atmospheric pressure. The mass of sheet m =0.1 ~kg and the specific heat capacity C _ v =900 ~J ~kg ⁻¹ ~K ⁻¹ . If the amount of heat supplied to the material is 8.1 10^2 ~J then change in area of the rectangular sheet is :-
Options
- A2.0 10⁻⁶ ~m ^2
- B3.0 10⁻⁷ ~m ^2
- C6.0 10⁻⁷ ~m ^2
- D4.0 10⁻⁷ ~m ^2
Correct answer
A. 2.0 10⁻⁶ ~m ^2
Step-by-step solution
aligned & Q = ms T & 8.1 10^2=0.1 900 T & A = A ₀ 2 ~T =2.0 10⁻⁶ ~m ^2 aligned