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Ex. 78: Two spheres 'X' and 'Y' have radii 2 cm and 5 cm respectively. The emissivity of 'X' is 0.5 and that of Y' is 0.3. The spheres are maintained at 227°C and 27°C respectively. Find the ratio of the energy radiated by 'X' to that radiated by 'Y' in the same time.

Ex. 78: Two spheres 'X' and 'Y' have radii 2 cm and 5 cm respectively. The emissivity of 'X' is 0.5 and that of Y' is 0.3. The spheres are maintained at 227°C and 27°C respectively. Find the ratio of the energy radiated by 'X' to that radiated by 'Y' in the same time.

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Ex. 78: Two spheres 'X' and 'Y' have radii 2 cm and 5 cm respectively. The emissivity of 'X' is 0.5 and that of Y' is 0.3. The spheres are maintained at 227 C and 27°C respectively. Find the ratio of the energy radiated by 'X' to that radiated by 'Y' in the same time.
Transcribed Image Text:Ex. 78: Two spheres 'X' and 'Y' have radii 2 cm and 5 cm respectively. The emissivity of 'X' is 0.5 and that of Y' is 0.3. The spheres are maintained at 227 C and 27°C respectively. Find the ratio of the energy radiated by 'X' to that radiated by 'Y' in the same time.
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