Question

desert sand is very hot in day &cold at night

Answer 1

 Since it has low specific heat capacity, means that the energy required to change the temperature of the sand is very little. Hence, in the day, the sand gets very hot due to the sun and during the night it gets very cold since it loses heat fast to the surroundings.

Answer 2

Since it has low specific heat capacity, means that the energy required to change the temperature of the sand is very little. Hence, in the day, the sand gets very hot due to the sun and during the night it gets very cold since it loses heat fast to the surroundings