The intrinsic carrier density at 300K is 1.5 × 1010/cm3,

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The intrinsic carrier density at 300K is 1.5 × 10¹⁰/cm³, in silicon. For n-type silicon doped to 2.25 × 10^{1 5} atoms/cm³, the equilibrium electron and hole densities are—

1. n = 1.5 × 10¹⁵/cm³, p = 1.5 × 10¹⁰/ cm³
2. n = 1.5 × 10¹⁵/cm³, p = 2.25 × 10¹⁵/ cm³
3. n = 2.25 × 10¹⁵/cm³, p = 1.0 × 10⁵/ cm³
4. n = 1.5 × 10¹⁰/cm³, p = 1.5 × 10¹⁰/ cm³

Correct Option: C

Given: ni = 1.5 × 10¹⁰ /cm³
ND = 2.25 × 10¹⁵ n

P_n		n_i²	=	(1.5 × 10¹⁰)²
		N_D		2.25 × 10¹⁵

= 1 × 10⁵/cm³ p