Nights in desserts are much cooler because
(a) humidity becomes high
(b) sand cools down faster
(c) wind blows vigorously
(d) it rains at night

Correct Answer: (b) sand cools down faster

Explanation:

Sand absorbs and radiates back the heat more quickly than the earth. Because, in the night, the sand temperature decreases at a faster rate making the surroundings cool down.

A desert cooler cools better on a hot, dry day because higher temperature and dryness of air increase the rate of evaporation of water from the cooler, causing an enhanced cooling effect. When humidity is high and temperature is low, the rate of evaporation decreases, and cooling also decreases.

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Updated on: 12-Jan-2023

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