A 'hole' in a semiconductor has
1. Positive charge equal to the electron charge
2. Positive mass equal to the mass of the electron
3. An 'effective mass' greater than the effective mass of electron
4. Negative mass and positive charge equal to the charge in nucleus

A. 1, 2, 3 and 4

B. 1 and 3 only

C. 2 and 4 only

D. 3 and 4 only

Answer: Option B