Neco Model Questions Vol1 2024 Biology Question 28
Practice objective / multiple choice question 28 from the 2024 Neco Model Questions Vol1 Biology examination.
At rest a person generates metabolic heat at a rate of 80 W. In a hot environment the body loses heat by radiation, which accounts for 30 % of the total heat loss. The skin surface area is 1.8 m\(^{2}\) and the temperature difference between skin and surroundings is 2 °C. The emissivity of skin is 0.95 and the Stefan‑Boltzmann constant is \(5.67\times10^{-8}\) W m\(^{-2}\) K\(^{-4}\). The remaining heat is dissipated by evaporation of sweat, whose latent heat of vaporisation is 2.43 kJ g\(^{-1}\). Assuming the radiative loss calculated from the given data equals the 30 % fraction, how many grams of water must be evaporated per hour to maintain thermal balance?
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This is Neco Model Questions Vol1 2024 Biology Question 28. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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