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MHT CET 2023 (10 May, Shift 2) · Thermal Radiation: Black Body, Stefan & Wien

Thermal Radiation: Black Body, Stefan & Wien question from MHT CET 2023 (10 May, Shift 2)

Q83MHT CET 2023 · 10 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 change in temperature of that body, it radiates maximum energy at wavelength $\frac{2\lambda}{3}$ . At that temperature emissive power is

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Answer: (a)

Wien: $\lambda_m \to \frac{2\lambda}{3}$ means $T \to \frac{3}{2}T$ .
Stefan: $E \propto T^4 \Rightarrow E' = \left(\frac{3}{2}\right)^4 E = \frac{81}{16}E$
So the answer is (a) $\frac{81}{16}$ (times $E$ ).

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