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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoRadiationMedium2 minQB

PhysicsMediumsingle choice

Rays from the sun are focused by a lens of diameter 5 cm on to a block of ice and $10 g$ of ice is melted in $20 min$ . (latent heat L = $80 cal/g$ ). Therefore the heat from the sun reaching the earth per min per square centimeter is

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Answer:

Solution:

$A = π (2.5)^{2} c m^{2}$
$Q = m L = 10 (80) = 800 cal$
$E = \frac{Q}{A t}$
$E = \frac{800}{π ( 2.5 ) ^{2} ( 20 )}$
$E \approx 2.04 cal/ (minc m^{2})$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Radiation

⏱ 2mℹ️ Source: QB

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