A system of binary stars of masses M1 and M2 are moving in circular orbits of radii R1 and R2 respectively. If T1 and T2 are the same time periods of masses M1 and M2 respectively then:
(a) T1/T2=(R1/R2)^1/2
(b)T1>T2 (if R1>R2)
(c) T1>T2 (if M1>M2)
(d)T1=T2
The common center of both orbits is also centre of mass of both the stars.
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