alleryThe law of periods uses which measurement of the ellipse?
ATotal perimeter
BMinor diameter
CSemi-major axis
DFocal distance
Answer & Solution
Correct answer: C. Semi-major axis
1. The size of the orbit has to be stated by one number.
2. The third law names that number.
3. It is the semi-major axis.
_Source: syllabus Physics Part I, Chapter 8, Gravitation._
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