A) generally, the crystals are expected to expand by temperature. what are the reasons for this? in which cases, it can be expected to decrease the size of the objects whose temperature increases.
b) explain the reasons for the formation of the forbidden band.
c) write down the reason why good conductors are used in mirror construction.
d) show sdia = sbas × sfcc for the structure factors; sdia, sbas, sfcc which are diamond crystal, the base of the diamond, and for fcc respectfully.

Suppose that a mass of 2 kg is attached a spring whose spring constant is 50. the system is damped such that b = 12 . the mass is set in motion with an initial velocity of -8 m/s at a position 0 meters from equilibrium. set up and solve a differential equation that models this motion. write your solution in the form a cos ( ω t − α ) where α is a positive number. use your solution to fill in the information below: what is the amplitude of the motion? what is the value of ω ? what is the phase shift?