Question

Assertion (A): The speed of revolution of the earth is uniform.

Reason (R): When the earth is closer to the sun, the gravitational pull makes the earth move faster than when it is away from the sun.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R does not explain A.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is false but R is true.

Explanation:

• Assertion (A) is false: The speed of Earth's revolution is not uniform. It varies throughout the year as the Earth moves in its elliptical orbit. The speed is higher when Earth is closer to the Sun (at perihelion) and slower when it is farther away (at aphelion).
• Reason (R) is true: When the Earth is closer to the Sun, the Sun's gravitational pull is stronger, causing the Earth to move faster in its orbit. This is consistent with Kepler's Second Law, which states that a planet moves faster when it is closer to the Sun.

Thus, the reason is true, but it doesn't explain the false assertion.