If the temperature of the sun becomes twice its present temperature, then
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(b) The wavelength corresponding to maximum emission of radiation from the sun is ${\lambda _{\max }} = 4753Å$ (close to the wavelength of violet colour of visible region).
Hence if temperature is doubled ${\lambda _m}$ is decreased $\left( {{\lambda _m} \propto \frac{1}{T}} \right)$ i.e. mostly ultraviolet radiations emits.
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