Question

A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following (Fig.) would correctly represent the result? Justify your choice.

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The correct option is D

Explanation for correct option

(D)

Latent heat of fusion

• The heat energy required to change $1\mathrm{kg}$ of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.
• This process results in the molecules within the substance becoming less organized.

Heating a beaker containing ice and water

• The mixture's temperature would be zero at the beginning of the experiment since water and ice are in equilibrium.
• Due to the latent heat of fusion, the temperature of the beaker's contents does not initially increase.
• As a result, the temperature remained constant for a while.
• The temperature of the water slowly rises as the mixture is heated further by the students.
• The temperature of content in the beaker as a function of time is as follows:

Explanation for incorrect options

• Figure (D) measures the temperature of the content of the beaker as a function of time correctly.
• Hence. all the other options (A), (B) and (C) are incorrect.

Therefore, the correct portion is (D).