Q. Two thermometers $A$ and $B$ are exposed in sun light. The valve of $A$ is pointed black, but that of $B$ is not pointed. The correct statement regarding this case is
A) Temperature of $A$ will rise faster than $B$ but the final temperature will be the same in both
B) Both $A$ and $B$ show equal rise in beginning
C) Temperature of $A$ will remain more than $B$
D) Temperature of $B$ will rise faster
Explanation
(a) As for a black body rate of absorption of heat is more. Hence thermometer $A$ shows faster rise in temperature but finally both will acquire the atmosphere temperature
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.