Test Academy | A “double star” is a composite system of two stars rotating about their center of mass under their mutual gravitational attraction. Let us consider such a “double star” which has two stars of masses m and 2m at separation l. If T is the time period of rotation about their center of mass then, T = 2π√(l³/mG), T = 2π√(l³/2mG), T = 2π√(l³/3mG), T = 2π√(l³/4mG)

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A “double star” is a composite system of two stars rotating about their center of mass under their mutual gravitational attraction. Let us consider such a “double star” which has two stars of masses m and 2m at separation l. If T is the time period of rotation about their center of mass then,

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T = 2π√(l³/mG)
T = 2π√(l³/2mG)
T = 2π√(l³/3mG)
T = 2π√(l³/4mG)

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