Models of the Atom II

What is the energy of a photon of wavelength 450nm?

Calculate the wavelength of a 4.3 eV photon

Determine the energy levels for the following state of Hydrogen, when n=3

• -13.6 eV

• -3.4 eV

• -1.51 eV

• 0.85 eV

• 3 eV

• 2.8 eV

• 2.85 eV

• 2.86 eV

Determine the wavelength of the emitted photon for the transitions between n=4 to n=2 (for Hydrogen)

• 486.2 nm

• 321.2 nm

• 656.3 nm

• 434.1 nm

How much energy is needed to ionise a hydrogen atom in the n = 3 state?

• 1.51 eV

• 12.09 eV

• 13.6 eV

• 15.11 eV

Suppose an electron of our hypothetical atom (figure on the left) has been excited to its second excited state (n=3). When it falls back to the ground state it can do so through a total of three possible transitions. How much energy is released falling from n=3 to n=1 directly?

• 13.6 eV

• 122.eV

• 30.6 eV

• 108.8 eV

Can you "see" that resulting photon of light emitted when the electrons fall from n = 3 back to the ground state? (i.e is it in the visible region of the spectrum?)

• Yes

• No

• Not enough information has been provided.