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If the distance between the earth and the sun were half its present value, the number of days in a year would have been(a) 64.5(b) 129(c) 182.5(d) 730

Lokesh kumar , 10 Years ago
Grade 6
anser 1 Answers
Deepak Patra

Last Activity: 10 Years ago

(b) According to Kepler’s law T21 / T22 = R31­ / R32

Here T1 = 365 days ; T2 = ?; R1 = R; R2 = R/2

? T2 = T1 (R2 / R1)3/2 = 365 [R/2 / R]3/2 = 129 days

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