Structure of Atom

For He+, a transition takes place from the orbit of radius 105.8‌pm to the orbit of radius 26.45‌pm. The wavelength (in nm ) of the emitted photon during the transition is
[Use:
Bohr radius, a=52.9‌pm
Rydberg constant, RH=2.2×10−18J
Planck's constant, h=6.6×10−34‌Js
Speed of light, c=3×108ms−1 ]