The bohr model gives a simple, but reasonably accurate, formula for the energy levels of an electron in an isolated hydrogen atom. when an electron moves from one energy level to another lower level, the difference in the energies between the two levels is emitted in a photon. what is the wavelength of the photon emitted when an electron falls from the fourth level to the first level?

Explanation:

For calculating wavelength, when the electron will jump from n=4 to n= 1

Using Rydberg's Equation: for hydrogen atom

Where,

= Wavelength of radiation  = ?

= Rydberg's Constant  =

= Higher energy level = 4

= Lower energy level = 1

Z= atomic number = 1  (for hydrogen)

Putting the values, in above equation, we get

Thus the wavelength of the photon emitted will be

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alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".