we know that energy in nth level is (hc/lemda),here denote lemda=l
so
E=E1-E2=2.4ev
E=E1-E2=hc/l;
put the value of "h and c"
{1ev=1.6*10^-19j}
2.4*1.6*10^-19 =(6.64*10^-34 *3*10^8)/l
l=5.187*10^-7m=518.7nm
so answer is (d)
A spectral line is emitted when an atom undergoes tranisition between two levels with a difference in energy of 2.4eV.What is the wavelength of the line (a)287nm(b)507angstrome units()377angstrome units(d)518nm
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