Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Consider the following in context of Kepler's Law:

1. Planets sweep equal areas in equal times while orbiting Sun.
2. Planets appear to move slower when they are farther from the sun than when they are nearer.
3.The orbital period squared is proportional to the size of the semi-major axis cubed.

Select the correct statements:

• A. 1 and 2 only
• B. 2 and 3 only
• C. 1 and 3 only
• D. All of the above

Answer 1

The correct option is D All of the above

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Kepler's laws of planetary motion include :
1) The orbit of a planet is an ellipse with the Sun at one of the two foci.
2) A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.
3) The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its orbit.