Question

Kepler's First and Third Laws Quick Check
4 of 54 of 5 Items
Question
Which of these describes Kepler’s third law of orbital motion?(1 point)
Responses

T2 ∝ a3
T2 ∝ a3

T3 ∝a2
T3 ∝a2

T∝a2
T∝a2

T2∝a
T2∝a
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Answer 1

Kepler's third law of orbital motion states that the square of the period of orbit (T) of a planet is directly proportional to the cube of the semi-major axis (a) of its orbit. This can be expressed mathematically as:

**T² ∝ a³**

So, the correct response is:

**T2 ∝ a3**