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Question 18N.2.SL.TZ0.5

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Date November 2018 Marks available [Maximum mark: 6] Reference code 18N.2.SL.TZ0.5
Level SL Paper 2 Time zone TZ0
Command term Determine, Explain, Identify Question number 5 Adapted from N/A
5.
[Maximum mark: 6]
18N.2.SL.TZ0.5

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.

(a)

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

[3]

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» ✔

(b)

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]

Markscheme

–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)

(c)

Explain your answer to (b).

[2]

Markscheme

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)

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