Silicon contains 5 × 1028 atoms per cubic metre. If it

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Silicon contains 5 × 10²⁸ atoms per cubic metre. If it is dpoed with two parts per million of arsenic then the electron density at room temperature will be approximately:

1. 4 × 10²³ m^{– 3}
2. 10²³ m^{– 3}
3. 2 × 10⁶ m^{– 3}
4. 10⁶ m^{– 3}

Correct Option: B

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