Assertion A: Earth has atmosphere whereas moon doesn’t have any atmosphere. [2023]

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Q.
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. [2023]

Assertion A: Earth has atmosphere whereas moon doesn’t have any atmosphere.

Reason R: The escape velocity on moon is very small as compared to that on earth.

In the light of the above statements, choose the correct answer from the options given below:

1 A is true but R is false

2 Both A and R are correct but R is NOT the correct explanation of A

3 Both A and R are correct and R is the correct explanation of A

4 A is false but R is true

Ans.
(3)

At Moon, due to low escape velocity, the rms velocity of molecules is greater than escape velocity. Hence molecules escape and there is no atmosphere at Moon.

Solution

1 A is true but R is false

2 Both A and R are correct but R is NOT the correct explanation of A

3 Both A and R are correct and R is the correct explanation of A

4 A is false but R is true

Ans.
(3)

At Moon, due to low escape velocity, the rms velocity of molecules is greater than escape velocity. Hence molecules escape and there is no atmosphere at Moon.

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Solution

1 A is true but R is false

2 Both A and R are correct but R is NOT the correct explanation of A

3 Both A and R are correct and R is the correct explanation of A

4 A is false but R is true

Ans. (3) At Moon, due to low escape velocity, the rms velocity of molecules is greater than escape velocity. Hence molecules escape and there is no atmosphere at Moon.

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Ans.
(3)

At Moon, due to low escape velocity, the rms velocity of molecules is greater than escape velocity. Hence molecules escape and there is no atmosphere at Moon.