According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

A. Directly proportional to the surface area

B. Directly proportional to the difference of temperatures between the two bodies

C. Either (A) or (B)

D. Both (A) and (B)

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly…
  2. Depending on the radiating properties, a body will be opaque when
  3. The emissive power of a body depends upon its
  4. Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without…
  5. The process of heat transfer from one particle of the fluid to another by the actual movement of the…
  6. A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat…
  7. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities.…
  8. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the…
  9. In counter flow heat exchangers
  10. According to Prevost theory of heat exchange
  11. Depending on the radiating properties, a body will be white when
  12. The most commonly used method for the design of duct size is the
  13. In a shell and tube heat exchanger, baffles are provided on the shell side to
  14. When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous…
  15. Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance,…
  16. Unit of thermal diffusivity is
  17. The total emissivity power is .defined as the total amount of radiation emitted by a black body per…
  18. Pick up the wrong case. Heat flowing from one side to other depends directly on
  19. Absorptivity of a body will be equal to its emissivity
  20. Thermal conductivity of water in general with rise in temperature
  21. Unit of thermal conductivity in S.I. units is
  22. Conduction is a process of heat transfer
  23. Thermal conductivity of water ________ with rise in temperature.
  24. Which of the following has maximum value of thermal conductivity?
  25. An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK).…
  26. The time constant of a thermocouple is
  27. The unit of Stefan-Boltzmann constant is
  28. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If…
  29. According of Kirchhoff's law
  30. The heat transfer takes place according to