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Grade: 9
        
The mean distance of two planet a and b from the sun is 2 and 4 times the distance of earth from the sun respectively. Find the ratio of the time taken by the two planets to make one revolution around the sun. 
10 months ago

Answers : (2)

Arun
22576 Points
							
 
As we know,
From kepler law,
T^2= k* r^3
 
Hence
(T1/T2)^2 = (r1/r2)^3
(T1/T2)^2  = (2r/4r)^3
T1/T2 = \sqrt(1/8)
T1/T2 = 1/2\sqrt2
10 months ago
Sayantan Garai
102 Points
							
From Kepler's law,
T²αR³
Hence,
(T1/T2)²=(R1/R2
=> T1/T2=√(1/2)³
                 =√(1/8)
=1 / 2√2
=√2 / 4
Hence answer is 1:2√2 or √2:4.
10 months ago
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