An $\alpha$-particle travels in a circular path of radius $0.45\,m$ in a magnetic field $B = 1.2\,Wb/m^2$ with a speed of $2.6 \times 10^7\,m/s$. The period of revolution of the $\alpha$-particle is:
- A$1.1 \times 10^{-5}\,s$
- B$1.1 \times 10^{-6}\,s$
- C$1.1 \times 10^{-7}\,s$
- D$1.1 \times 10^{-8}\,s$
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