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The question is as follows:

If excitation energy is provided by inelastic collisions between molecules, what is the temperature at which mercury vapour lamp will emit Ultra violet light of wavelength 2586 Angstrom?

I tried applying Wein's displacement law(lamda * T = 2.898 *10^(-3)metre-Kelvin . I got the answer as 11000 Kelvin. But the answer given in my book is 55000 Kelvin.Here the symbol ^ represents power.Please help me in solving this problem.

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# Homework Help: Modern Physics

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