After a hot sunny day, people sprinkle water on the roof-top because _______.

water helps air around the roof-top to absorb the heat instantly

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water has lower specific heat capacity

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water is easily available

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water has large latent heat of vaporisation

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Solution

The correct option is D water has large latent heat of vaporisation
$Q = m L_{v}$
Water has high latent heat of vaporization, so it absorbs more heat from the surrounding area, before converting to vapors (evaporation), and cools down the surrounding area.

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