A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.
For ground level, n1=1. E1=−13.67/n12=13.67eV The atom is excited to higher level, n2=4. E2=−13.67/n22=13.67/16 eV E=E1−E2=hc/λ λ=E1−E2hc ⇒13.67−1613.676.6×10−34×3×108 ⇒λ=97nm c=λν ⇒ν=3.1×1015Hz
