Question : Which of the following laws, represented by the formula T2/R3, compares the orbital period and radius of the orbit of a planet with that of other planets?
Option 1: Hubble's Law
Option 2: Copernicus's Law
Option 3: Kepler's Third Law
Option 4: Bragg's Law
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Correct Answer: Kepler's Third Law
Solution : The correct option is Kepler's Third Law.
Kepler's Third Law states that the square of the period is approximately equal to the cube of the radius.
It states that the square of the orbital period (T) of a planet is directly proportional to the cube of the semi-major axis of its orbit (R 3 ). Mathematically, it is represented by the formula T 2 = k * R 3 , where T is the orbital period, R is the semi-major axis of the orbit, and k is a constant that is the same for all planets orbiting the same central body (like the Sun).
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