Which of the following can be determined by using a Hall

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Which of the following can be determined by using a Hall crystal?
1. Concentration of holes in a p-type semiconductor.
2. Concentration of electrons in an n-type semiconductor.
3. Temperature of a the set-up with any type of semiconductor.
4. Diffusion constant and life-time of minority carriers of any type of semiconductor.
Select the correct answer using the code given below:

1. Only 1 and 2
2. 1, 2 and 4
3. Only 3 and 4
4. Only 2 and 4

Correct Option: A

Hall effect is used to determine whether a semiconductor is n-type or p-type and to find the carrier concentration. Hence alternative (A) is the correct choice.