Question

Three substances A, B and C of same mass are present at their respective melting points. On heating, if they melt completely in 5 minutes, 7 minutes and 3 minutes respectively, then which substance has the highest specific latent heat?

(Assume heat is absorbed at the same rate)

विकल्प

• Substance A

• Substance B

• Substance C

• All the substances have same specific latent heat.

Answer 1

Substance B

Explanation:

At the melting point of a substance, the heat supplied is utilised for melting, given by the equation Q = mL, where L denotes the specific latent heat.

Since the masses are the same and heat is absorbed equally, the substance that requires a longer time to melt requires more heat and thus possesses a higher specific latent heat.

Among A (5 min), B (7 min), and C (3 min), substance B takes the longest time.

Hence, substance B has the highest specific latent heat.