9.7 + 7.5 =
A) 16.12 B) 17.12 C) 16.2 D) 17.2
D
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Technician A says that a crowfoot socket can be used with a ratchet. Technician B says that a crowfoot socket can be used with an extension. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
A chemical liquid has gotten into your eye. You should flush it with water at the eyewash station for at least:
A. five minutes B. fifteen minutes C. ten minutes D. twenty minutes
In a semiconductor material, the net charge is zero. This requires the density of positive charges to be equal to the density of negative charges. Both charge carriers (free electrons and holes) and ionized dopant atoms have a charge equal to the magnitude of one electronic charge. Therefore the charge neutrality equation (CNE) is:
where
no = equilibrium negative carrier density
po = equilibrium positive carrier density
= ionized acceptor density
= ionized donor density
The carrier product equation (CPE) states that as a semiconductor is doped, the product of the charge carrier densities remains constant:
The semiconductor material is n- or p-type depending on whether donor or acceptor doping is greater. Almost all dopant atoms are ionized at room temperature. If intrinsic silicon is doped:
Determine:
a. If this is an n- or p-type extrinsic semiconductor.
b. Which are the majority and which are the minority charge carriers.
c. The density of majority and minority carriers.
Three major mother breeds of swine are the Chester White, Landrace, and:
a. Duroc c. Hampshire b. Berkshire d. Yorkshire