# An electron in a hydrogen like atom makes transition from a state in which itd de Broglie wavelength is lambda_(1) to a state where its de Broglie w

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An electron in a hydrogen like atom makes transition from a state in which itd de Broglie wavelength is lambda_(1) to a state where its de Broglie wavelength is lambda_(2) then wavelength of photon (lambda) generated will be :
A. lambda=lambda_(1)-lambda_(2)
B. lambda=(4mc)/(h){(lambda_(1)^(2)lambda_(2)^(2))/(lambda_(1)^(2)-lambda_(2)^(2))}
C. lambda=sqrt((lambda_(1)^(2)lambda_(2)^(2))/(lambda_(1)^(2)-lambda_(2)^(2)))
D. lambda=(2mc)/(h){(lambda_(1)^(2)lambda_(2)^(2))/(lambda_(1)^(2)-lambda_(2)^(2))}

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