IB Physics HL B.1.17 Wien’s displacement law Question Bank

Practise IB Physics HL B.1.17 by combining Wien's law, redshift scaling and spectra to analyse stellar and cosmic microwave background temperatures.

Exam points

Use Wien's law with redshift scaling to relate CMB temperature to the cosmic scale factor.
Combine peak wavelength, Stefan–Boltzmann data and spectra to compare temperatures of stars and compact objects.

[Maximum number: 1]

Star A is a main sequence star.

The data for Star A and the Sun are given in a table.

Table for Question B.1.17—Wien’s displacement law question 1 — IB Physics HL

Show that the peak wavelength emitted from Star A is about 560 nm .

$\lambda_{\text {max }}=\frac{2.9 \times 10^{-3}}{5200}=5.58 \times 10^{-7} \mathrm{~m}$ OR $558 \mathrm{~nm}$

Must see full substitution OR answer to 3 (or more) significant
figures.

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B.1.17—Wien’s displacement law question 1