Consider that an electron is revolving in an excited state of Hydrogen atom with velocity 25.6 10 5 ms -1 . The radius of the orbit is x 10 -9 m. The value of x is: [Take the mass of electron to be 9 10 -31 kg, charge of electron =-1.6 10 -19 C and 1 4 0 =9 10 9 Nm 2 C -2 ]

1. A. 4
2. B. 3
3. C. 2
4. D. 1

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