Assign reason for the following, i. Phosphorus doped silicon is a semiconductor. ii. Schottky defect lowers the density of a solid. ii. Some of the very old glass object appear slightly milky instead of being transparent.

Explanation

i. It is because its C0nđitance is intermeidate between C0nductor
and an insulator.
ii, lin schottky defect., both cations and anions "are missing which leads to lowering indensity of a solid.
Gilass is super C0oled liquid, therefore very. old glass objects beC0me slightly milky becatise of heating during the day and C0oling at nights. ie, annealing over a number of years glass acquires some çrystalline character.