Physics, Chemistry, Mathematics Forums

 Please reply to these problems with solution.

1. Calculate the wavelength of the radiations in nanometers emitted when  an electron in hydrogen atom jumps from third orbit to the ground state. (Rydberg's constant = 109677 cm^-1  ).          [Ans. 103 nm]

2. Calulate the wavelength of proton which will be emitted when the electron of hydrogen atom jumps from fourth shell to the first shell. Ionisation energy of hydrogen atom is 1.312 * 10³ kJ mol^-1 . [Ans. 9.725 *10^-8]

3. The ionisation energy of He⁺ ion is 19.6 * 10^-18 J atom^-1. Calculate the energy of the first excited state of Li²⁺ ion.  [Ans. -4.41 * 10^-17 J atom^-1]

Thank You