MHT CET202121 Sep 2021Morning ShiftPhysicsThermal Properties of MatterActual
The temperature difference between two sides of metal plate, 3 ~cm thick is 15^ C . Heat is transmitted through plate at the rate of 900 kcal per minute per m ^2 at steady state. The thermal conductivity of metal is
Options
- A1.8 10⁻² kcal ms ^ C
- B4.5 10⁻² kcal ms ^ C
- C3 10⁻² kcal ms ^ C
- D6 10⁻² kcal ms ^ C
Correct answer
C. 3 10⁻² kcal ms ^ C
Step-by-step solution
aligned & Q t = kA d & k = Q tA d & Q tA =900 kcal per minute per m ^2= 900 60 =15 kcal / s m ^2 & ~d =3 ~cm =3 10⁻² ~m , =15^ C & k = 15 3 10⁻² 15 =3 10⁻² kcal / s m . ^ C aligned