What is the wavelength of radiation emitted when an electron goes from the n = 7 to the n = 4 level of the Bohr hydrogen atom? Give your answer in nm.

the wavelength of radiation emitted  is

Explanation:

The energy of the Bohr's hydrogen atom can be expressed with the formula:

For n = 7:

For n = 4

The  electron goes from the n = 7 to the n = 4, then :

Wavelength of the radiation emitted:

where;

hc  = 1242 eV.nm

i believe it is 40–40–20%

explanation: