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Date November 2018 Marks available 2 Reference code 18N.2.SL.TZ0.5
Level Standard level Paper Paper 2 Time zone 0 - no time zone
Command term Explain Question number 5 Adapted from N/A

Question

The diagram shows the position of the principal lines in the visible spectrum of atomic hydrogen and some of the corresponding energy levels of the hydrogen atom.

Determine the energy of a photon of blue light (435nm) emitted in the hydrogen spectrum.

[3]
a.

Identify, with an arrow labelled B on the diagram, the transition in the hydrogen spectrum that gives rise to the photon with the energy in (a).

[1]
b.

Explain your answer to (b).

[2]
c.

Markscheme

identifies λ = 435 nm ✔

E = « h c λ =»  6.63 × 10 34 × 3 × 10 8 4.35 × 10 7  ✔

4.6 ×10−19 «J» ✔

a.

–0.605 OR –0.870 OR –1.36 to –5.44 AND arrow pointing downwards ✔

Arrow MUST match calculation in (a)(i)

Allow ECF from (a)(i)

b.

Difference in energy levels is equal to the energy of the photon ✔

Downward arrow as energy is lost by hydrogen/energy is given out in the photon/the electron falls from a higher energy level to a lower one ✔

Allow ECF from (a)(i)

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Core » Topic 7: Atomic, nuclear and particle physics » 7.1 – Discrete energy and radioactivity
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