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MHT CET 2023 (12 May, Shift 2) · Thermal Radiation: Black Body, Stefan & Wien

Thermal Radiation: Black Body, Stefan & Wien question from MHT CET 2023 (12 May, Shift 2)

Q82MHT CET 2023 · 12 MAY · SHIFT 2Medium

Thermal Radiation: Black Body, Stefan & Wien

A black body radiates maximum energy at wavelength ' $\lambda$ ' and its emissive power is ' $E$ '. Now due to a change in temperature of that body, it radiates maximum energy at wavelength $\frac{\lambda}{3}$ . At that temperature emissive power is

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Answer: (c)

Wien: $\lambda_m \to \frac{\lambda}{3}$ means $T \to 3T$ .
Stefan: $E \propto T^4 \Rightarrow E' = 3^4 E = 81E$
Ratio new : old $= 81 : 1$ , so the answer is (c).

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