AP EAMCET202418 May 2024Morning ShiftPhysicsThermal Properties of MatterActual
The length of a metal bar is 20 cm and the area of cross section is 4 10⁻⁴ ~m ^2 . If one end of the rod is kept in ice at 0^ C and the other end is kept in steam at 100^ C , the mass of ice melted in one minute is 5 g . The thermal conductivity of the metal in Wm ⁻¹ ~K ⁻¹ is (Latent heat of fusion =80 cal / gm )
Options
- A140
- B120
- C100
- D160
Correct answer
A. 140
Step-by-step solution
1=20 ~cm =0.2 ~m , ~A =4 10⁻⁴ ~m ^2, ₁=0^ c , ₂=100^ c H= k A ( ₂- ₁ ) 1 ~mL t = kA ( ₂- ₁ ) 1 aligned & 5 80 4.2 60 = k 4 10⁻⁴ 100 0.2 & k =140 ~W _ m ⁻¹ k ⁻¹ . aligned