Question

How much energy will be absorbed when an electron jumps from n=2 to n=4 orbit?

Answer 1

first find wavelength by the formula 1/lambda = R [1/n1^2 - 1/n2^2 ] where R=rydberg const. and n1=2 and n2=4
then .. E =hc/ lambda ( e=energy ; h=plancks const. ;c= speed of light)