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For He^+, a transition takes place from ...

For `He^+`, a transition takes place from the orbit of radius 105.8 pm to the orbit of radius 26.45 pm. The wavelength (in nm) of the emitted photon during the transition is ___.
[Use:
Bohr radius, a = 52.9 pm
Rydberg constant, `R_H = 2.2 xx 10^(-18)` J
Planck’s constant, `h = 6.6 xx 10^(-34) J s`
Speed of light, `c = 3 xx 10^8 ms^(-1)`]

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