The revolution of a given planet around the sun is 1000 days. If the distance between the planet and the
sun is made 1/4th of original value, then how many days will make one year?
(a) 180 days      (b) 400 days
(c) 125 days      (d) 250 days
 

Dear Student


According to Kepler's law
T2α R3T2T12=R2R13T1=1000 daysR2=R1/4T210002=R1/4R13T210002=143=164T22=15625T2=125 Days
Regards

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