The correct option is B 1000 min
Time period of a satellite orbiting around the earth is given by,
g=acceleration due to gravity =9.8 ms−2
R=Radius of the Earth=6.3×106 m,
Height of the polar satellite above earth surface lies in between 500 to 900 km, so the average value,
Substituting the values in the above equation,
Thus, time period of polar satellites is about 100 minutes
Hence, option (b) is the correct answer.