Question

Two liquids A and B cool according to Newton’s law of cooling for same surrounding temperature. From the given graph, choose correct alternative(s) The liquids loose heat due to radiation only.

• A. At an instant, rate of cooling is lesser in A than in B
• B. At an instant, rate of cooling of A is same as that of B
• C. At given instant of time, the wavelength of radiation corresponding to maximum intensity is less for liquid A than for liquid B
• D. If both the liquids A and B emit same quantity of heat in the given time intervals, then their thermal capacities will be equal

Answer 1

Answer: (A), (C)

The correct options are
A At an instant, rate of cooling is lesser in A than in B
C

At given instant of time, the wavelength of radiation corresponding to maximum intensity is less for liquid A than for liquid B

According to the cooling curve, liquid A takes more time than liquid B to cool. Hence rate of cooling is less for A. Also, ${\lambda }_m$ T=b. For liquid A, T is more.