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Structure of the Atom · Paper 2 — Free Physics SL Practice Questions

1MasterySAQ-SAtomic models (Bohr, quantum model)5 marksPaper 2~8 min

Data

1\,\text{eV} = 1.60 \times 10^{-19}\,\text{J}

c = 3.00 \times 10^{8}\,\text{m\,s}^{-1}

h = 6.63 \times 10^{-34}\,\text{J\,s}

E_n = -\dfrac{13.6}{n^2}\,\text{eV}

A medical physicist studies the emission spectrum of hydrogen gas. She observes a photon of wavelength

486\,\text{nm}

emitted when an electron in a hydrogen atom transitions from a higher energy level to the

n = 2

level. The energy of the

n = 2

level is

-3.40\,\text{eV}

(a)

State one feature of the Bohr model that explains why hydrogen emits only discrete wavelengths of light. [1 mark]

(b)

Calculate the energy of the

486\,\text{nm}

photon in eV. [2 marks]

(c)

Show that the initial energy level of the electron is

n = 4

. [2 marks]

Solutions

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