The density of NaCl crystal is `2.165 gmcm^-3` and the distance between Consecutive cation and anion is 281 pm. Calculate the value of Avogadro's numbers.

If the distance between the point (C, 2) and (3, 4) is 2 cm find the value of C.

Calculate the value of Avogardo Constant from the following data. Density of NaCl = 2.165 gcm^-3 , distance bet^n Na^+ and Cl^- in NaCl = 281 pm (molar mass of NaCl = 58.5 gmol^-1)

In a double slit experiment, if the screen is moved by 5 x 10^-2 m towards the slit the change in fringe width is 3 x 10^-5 m. If the distance between the slits is 10^-3 m, calculate the wavelength of the light used.

Find the value of y for which the distance between the pointsP(2,-3) and Q(10,y) is 10 units.

A crystal of lead (Ii) sulphide has fcc structure. In this crystal the shortest distance between a Pb^(2+) ion and a S^(2-) ion is 297pm. What is the length of the unit cell is lead sulphide? Also Calculate the unit cell volume (N_A=6.023xx10^23 mol^-1, Pb=297.2u, S=42 u)