DP Physics (last assessment 2024)

Question 18N.3.HL.TZ0.18c

[Maximum mark: 2]

18N.3.HL.TZ0.18c

The surface temperature of the star Epsilon Indi is 4600 K.

(c)

The Sun will spend about nine billion years on the main sequence. Calculate how long Epsilon Indi will spend on the main sequence.

[2]

Markscheme

$\frac{{{T_E}}}{{{T_ \odot }}} =$ « $\frac{{\frac{{{M_E}}}{{{L_E}}}}}{{\frac{{{M_ \odot }}}{{{L_ \odot }}}}} = \frac{{0.64}}{{0.21}} =$ » 3.0 ✔

T ≈ 27 billion years ✔

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