Which among the following are true regarding Kepler rsquo s laws of planetary motion 1 nbs...........

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Which among the following are true regarding Kepler’s laws of planetary motion?

1. Every planet revolves around the sun in an oval-shaped path called an ellipse. The sun is located at one focus of each of the planetary orbits.

2. An imaginary line from the centre of the sun to the centre of a planet sweeps out the same area within any section of the orbit during a given time.

3. The square of the periods of any three planets is proportional to the cubes of their mean distances from the sun.

Select the correct answer using the codes given below

1, 2 and 3

2 and 3

1 and 2

1 and 3

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Explanation:

The orbit of a planet is an ellipse with the Sun at one of the two foci. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.