An α- particle travels in a circular path of radius 0.45 m in a magnetic field B=1.2 Wb/m2 with a speed of 2.6×107 m/sec . The period of revolution of the α- particle is

(a)  1.1×10-5  sec          (b)  1.1×10-6 sec

(c)  1.1×10-7 sec           (d)  1.1×10-8 sec

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