After about how many years of formation of earth, life appeared on this planet?

A \(50\) billion years
B \(500\) billion years
C \(50\) million years
D \(500\) million years

Verified Solution

Answer & Solution

Correct Answer

(D) \(500\) million years

Step-by-step Solution

Detailed explanation

The correct answer is option (4) as life appeared 500 million years after the formation of earth. i.e. almost 4 billion years back.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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