Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;

Define ligancy and critical radius ratio. Calculate critical radius radio for ligancy 6.

Draw the unit cell of HCP structure and work out the no. of atoms per unit cell.

What is the principle of solar cell? Write its advantages and disadvantages

Draw and explain the unit cell of sodium chloride (NaCl) crystal determine effective number of NaCl molecule per unit cell and co-ordination number.

Find the following parameter for DC(Diamond Cubic) structure:- 
⦁ No. of atoms per unit cell.
⦁ Co-ordination number.
⦁ Nearest atomic distance.
⦁ Atomic radius.
⦁ APF.

Calculate the critical radius ratio of an ionic crystal in ligancy-6 . what is the maximum size of cation in ligancy 6 configuration when size of anion is 2.02A°?

With neat diagram of unit cell, explain the structure of NaCl crystal and calculate the no .of ions per unit cell, co ordination no. and lattice constant. Calculate the packing factor of NaCl crystal assuming the radius of _Na+is 0.98 A° and radius of Cl is 1.81 A°. 

A quartz crystal of thickness 1.5 mm vibrating with resonance. Calculate it’s fundamental frequency if the Young’s modulus of quartz crystal is 7.9×10¹⁰N/m² and density is 2650 kg/m³ .