The frequency and wavelength of a photon emitted during a transition from n = 5 state to the n = 2 state in the hydrogen atom are respectively :
1. \(6.91\times10 ^{14} Hz\); 543 nm
2. \(7.91\times10 ^{14} Hz\); 434 nm
3. \(6.91\times10 ^{14} Hz\); 434 nm
4. \(7.91\times10 ^{14} Hz\); 343 nm
The energy and the radius of the first orbit of He+ are respectively :
1. \(-8.72\times 10^{-18}J\); 0.02645 nm
2. \(8.72\times 10^{-18}J\); 0.02645 nm
3. \(-7.82\times 10^{-18}J\) ; 0.03655 nm
4. \(7.82\times 10^{-18}J\); 0.03655 nm