15) Which one of the following is completely amorphous? a) iron b) diamond c) hi

Question

15) Which one of the following is completely amorphous?

a) iron

b) diamond

c) high density polyethylene

d) window glass

.

16) Which colored semiconductor material will have the smallest bandgap?

a) yellow

b) black

c) red

d) orange

.

17) P-doping of a semiconductor does what?

a) Forms an intrinsic semiconductor

b) Creates a new empty band just above the valence band.

c) Creates a new full band just below the conduction band

d) Changes the semiconductor into an insulator

Please answer all of them without guessing!!! Thanks

Explanation / Answer

Answer – 15) We know the amorphous means the substance which have no definite shape and size. It is not in the definite lattice pattern, so the most amorphous solids are like glass, gel and polymers, so answer is c) high density polyethylene and d) window glass

16) The bandgap energy is equal the energy of the electron-hole pair produced by a photo, so semiconductor will not absorb photons of energy less than the band gap. We know the red color has the lowest frequency than others, so the energy is less than other and it has smallest bandgap.

So answer is c) red.

17) We know the impurities into a semiconductor crystal to the defined modification of conductivity is called doping. The P-doping semiconductor is creating a new empty band just above the valence band and creates a new full band just below the conduction band.

So answer is b and c.

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