Question

A large number of water drops each of radius r combine to have a drop of radius R. If the surface tension is T and the mechanical equivalent at heat is J then the rise in temperature will be

A. 2T / rJ
B. 3T / RJ
C. 3T / J{1/r – 1/R}
D. 2T / J{1/r – 1/R}

Answer 1

The correct answer is option D: 2T / J{1/r – 1/R}

Step-by-step explanation:

The rise in temperature, A, can be calculated using the formula:

A = \frac{2T}{J(\frac{1}{r} - \frac{1}{R})}

Here, T represents surface tension, r represents the radius of the initial water drops, R represents the radius of the larger drop, and J represents the mechanical equivalent of heat.

The correct answer is option D: 2T / J{1/r – 1/R}.