Concepts Of Physics MCQ Edition [Volume 2]PhysicsHeat Transfer

During summer, a mild wind is frequently observed on the shore of a calm river. This phenomenon is caused by

Options

Aradiation from the soil
Bthe difference in thermal conductivity of water and soil
Cconvection currents
Dconduction between the air and the soil

Correct answer

C. convection currents

Step-by-step solution

During summer days, the land heats up faster than the water in the river because the specific heat capacity of soil is less than that of water. The air above the land gets heated, expands, and rises up, creating a region of low pressure. To fill this low-pressure region, cooler air from above the river moves towards the land. This movement of air sets up convection currents, which are observed as a mild wind on the shore.

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