If the distance between earth and the sun were
half of its present value , then how many number of days will be there in at year?

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Solution

According to Kepler’s law

T² ∝ r³

(T₁ / T₂)² = (r₁ / r₂)³

(365 / T₂)² = (2r₁ / r₁)³

(365 / T₂)² = 8

365 / T₂) = 2√2

T₂ = 365 / (2√2)

T₂ = 129 days

There will be 129 days in an year.

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