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

Answer 1

Answer: (B)

Cylindrical bulb thermometer

$\text{Solution}:$

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.

$\text{Hece A is the correct option}$