10 C atoms, therefore 10 p -electrons.

Ground state; levels 0, 1, 2 are full

Therefore the electron goes from n = 2 to n = 3

Ephoton = E3 -E2 = (32 - 22)h2/2ml2 = [5(6.63X10-34 Js)]/[2(9.1X10-31 kg)(10X0.15X10-9 m)]

= 5.37X10-19 J

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