Question

A student touches a freshly baked cake that was taken out of the oven. Which best explains why the cake feels hot? Molecules in the skin are moving faster than molecules in the cake. Molecules in the cake are moving faster than molecules in the skin. The kinetic energy of molecules in the cake is more than the energy in the baking tray. The kinetic energy of molecules in the baking tray is more than the energy in the cake.

Answer 1

Answer: Option (b) is the correct answer.

Explanation:

When the cake is baked then due to the heat provided to it there will occur movement of its molecules.

As a result, molecules will gain kinetic energy due to which there will occur collisions between them.

Also,       $K.E \propto \frac{3}{2}kT$

Hence, more is the heat provided to the cake more will be the kinetic energy of its molecules due to which when we touch it, it feels hot.

Thus, we can conclude that molecules in the cake are moving faster than molecules in the skin, best explains why the cake feels hot.

Answer 2

Answer:

b

Explanation: