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Grade: 6
        
A geo-stationary satellite orbits around the earth in a circular orbit of radius 36,000 km. Then, the time period of a spy satellite orbiting a few hundred km above the earth’s surface (Rearth = 6,400km) will approximately be
(a) ½ hr
(b) 1 hr
(c) 2 hr
(d) 4 hr
5 years ago

Answers : (2)

Deepak Patra
askIITians Faculty
471 Points
							

(c) Note : A satellite revolving near the earth’s surface has a time period of 84.6 min.

We know that as the height increases, the time period increases. Thus the time period of the spy satellite should be slightly greater than 84.6 minutes.

T = 2 hr
5 years ago
Riya
13 Points
							
we know that a time period of geostationary satellite is 24 hours’
T^2 is directly proportional to R^3
T2/T1=(R2/R1)^3/2
 
T2/24=(6400/36000)^3/2
T2=24 x (6400/36000)^3/2
 
T2= 2 hours
 
hence c is the correct option.
 
Hence c is the correct answer.
4 months ago
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Course Features

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  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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