Question

The reason for quick hotness of sand more than the bank side water in a river is:
(A) Specific heat of water is more than sand
(B) Specific heat of water is less than sand
(C) Specific heat of water is equal than sand
(D) Due to local conditions

Answer 1

Hint
Water's high heat capacity is a property caused by hydrogen bonding among water molecules. When heat is absorbed, hydrogen bonds are broken and water molecules can move freely. When the temperature of water decreases, the hydrogen bonds are formed and release a considerable amount of energy.

Complete step by step answer
Specific heat is how much heat energy is needed to raise the temperature of a substance. Water has a very high specific heat. Sand and asphalt, on the other hand, have lower specific heats. This means that their temperatures change more quickly.
The sand should both heat and cool faster than the water. This is because water has a higher specific heat capacity than sand – meaning that it takes a lot of heat, or energy, to raise the temperature of water one degree, whereas it takes comparatively little energy to change the temperature of sand by 1o.
Option (A) is correct.

Note
The heat capacity and the specific heat are related by $C=cm$ or $c=C/m$. The mass $m$, specific heat $c$, change in temperature $ΔT$, and heat added (or subtracted) $Q$ are related by the equation: $Q=mcΔT$. Values of specific heat are dependent on the properties and phase of a given substance.