#### scardizzle

##### Salve!

First question comes from jacaranda q3 on p435

The radius of the orbit of an electron in the ground state of the hydrogen atom is 5.3 x 10^-11m. Calculate the radius of an electron when it is in each of the following states:

a) n = 2

b) n = 3

c) n = 4

And one from dot point:

2 lines in the spectrum of an atom have frequencies of 4.0 x 10^14 and 5.6 x 10^14 Hz

a) calculate the wavelength of the photons responsible for these spectral lines

b) Predict the frequency of a 3rd spectral line

c) Account for your answer b)

Any help would be very appreciated.