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what are the frequency and wavelength of a photon emitted during a transition from n = 5 state to the n =2 state in the hydrogen atom?

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`Delta E = 2.18 xx 10 ^(-18 ) [ (1)/(n_(1)^2 ) - (1) / (n_(1) ^(2))]J // " atom " e,=hv = ( hc ) /( lamda )`
` v= 6.91 xx 10 ^(14) Hz`
` lamda = 434 nm`
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