Question

Two thermometers are constructed in the same way except that one has a spherical bulb and the other a cylindrical bulb; which one will respond quickly to temperature changes?

A

Spherical bulb thermometer

B

Cylindrical bulb thermometer

C

both equally

D

either

Medium
Solution
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Correct option is B)

1. The flow of heat is proportional to the surface area or area of cross-section.
2. We know that, the surface area of a cylindrical bulb is more than that of spherical surface. 
3. Therefore, the thermometer with cylindrical bulb responds more quickly to temperature change than the thermometer with spherical bulb.

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