DP Physics (last assessment 2024)
Question 18M.3.SL.TZ1.11a.i
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.SL.TZ1.11a.i |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Suggest | Question number | a.i | Adapted from | N/A |
a.i.
[Maximum mark: 2]
18M.3.SL.TZ1.11a.i
The graph shows the observed spectrum from star X.
The second graph shows the hydrogen emission spectrum in the visible range.
(a.i)
Suggest, using the graphs, why star X is most likely to be a main sequence star.
[2]
Markscheme
the wavelengths of the dips correspond to the wavelength in the emission spectrum
the absorption lines in the spectrum of star X suggest it contains predominantly hydrogen
OR
main sequence stars are rich in hydrogen
[2 marks]
