Edexcel IGCSE Physics 8.11P Absolute magnitude
Practise defining absolute magnitude as a measure of star brightness at a fixed standard distance, including HR diagram labels.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- state that absolute magnitude represents brightness or luminosity at a standard distance
- choose absolute magnitude as the y-axis label or brightness measure for HR diagrams
8.11P Absolute magnitude question 1
[Maximum number: 2]
This question is about stars.
Astronomers measure the absolute magnitude of stars.
State what is meant by the term absolute magnitude.
- measurement of the brightness of a star
- at a standard distance
Accept:
- measurement of luminosity / power of a star
- apparent magnitude
- at 10 pc / 32.6 ly
Marking guidance:
- Condone incorrect distance.
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