If the radius of `Br^-` ions is 0.182 nm, how large a cation can fit in each of the tetrahedral hole?

Br^- ions from a close packed structure. If the radius of Br^- ion is 195 pm, calculate the radius of the cation that just fits into the tetrahedral hole. Can a cation having a radius of 82 pm be slipped into the octahedral hole of the crystal A^+Br^- ?

CaS exists in a cubic close packed arrangement of S^(2-) ions in which Ca^(2+) ions occupy 1/2 of the available tetrahedral holes. How many Ca^(2+)and S^(2-) ions are contained in the unit cell?

In the radius of the anion in an ionic acid solid is 200pm, what would be the radius of the cation that fits exactly into a cubic hole:

In the closed packing of atoms A ("radius":r_(a)) , the radius of atom B that can be fitted into tetrahedral void is:

The two parallel circular loops of wire shown in fig each have a radius R = 20 cm and are separated by a distance a = 0.5 cm. The bottom loop is held fixed and the top loop hangs from one end of the arm of an equal arm balance. Since a is much smaller than R, the magnetic field produced by one loop at the other is practically the same as if both were long straight wires. if the curret in each loop is 20 A, how big is the force of attraction of one loop for the other?

a circular drum having radius 4.2 m and height 3.5 m, how many bags of rice can be emptied when the space required for rice in each bag is 2.1 cubic m.

A point charge causes an electric flux of -1.0 xx 10^3 Nm^2//C to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge - If the radius of the Gaussian surface were doubled, how much flux would pass through the surface?

Consider a 20 W bulb emitting light of wavelength 5000 oversetcircA and shining on a metal surface kept at a distance 2m . Assume that the metal surface work function of 2eV and that each atom on the metal surface can be treated as a cirular disc of radius 1.5 A. How many photons would atomic disc receive within time duration calculated in (iii) above?

Consider a 20 W bulb emitting light of wavelength 5000 oversetcircA and shining on a metal surface kept at a distance 2m . Assume that the metal surface work function of 2eV and that each atom on the metal surface can be treated as a cirular disc of radius 1.5 A. How much time would be required by the atomic disc to receive enrgy equal to work function.

Calculate the height of the potential barrier for a head on collision of two deuterons. (Hint: The height of the potential barrier is given by the Coulomb repulsion between the two deuterons when they just touch each other. Assume that they can be taken as hard spheres of radius 2.0 fm.)