question_answer

The time period of a satellite of earth is 5 h. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become                                                                              [AIEEE 2003]

A)  10 h    

B)       80 h  

C)  40 h    

D)       20 h

Correct Answer: C

Solution :

[c] According to Kepler's law,

where, T is time period and r is radius of the orbit follower by sattelites

or                                  ... (i)

... (ii)

From Eqs. (i) and (ii),

T’ = 40 h