The wavelength of `K_(alpha)` X-rays of two metals `A and B` are` 4 // 1875 R and 1// 675 R`, respectively , where `R` is rydberg 's constant. The number of electron lying between `A and B` according to this lineis

Difference in wavelength of two extreme lines of H-atom in Balmer region is (where R_(H) is Rydberg constant ):

The densitis of two solid spheres A and B of the same radii R very with radial distance r as p_A(r ) = k ((r )/(R )) and p_B(r ) = k((r )/(R )^5, respectively, where k is a constant . The moments of inertia of the inividual spheres about axes passing throgh their centres are I_A and I_B respectively. if (I_B)/(I_A) = (n)/(10), the value of n is

The densitis of two solid spheres A and B of the same radii R very with radial distance r as p_A(r ) = k ((r )/(R )) and p_B(r ) = k((r )/(R )^5, respectively, where k is a constant . The moments of inertia of the inividual spheres about axes passing throgh their centres are I_A and I_B respectively. if (I_B)/(I_A) = (n)/(10), the value of n is

Two identical satellites A and B are circulating round the earth at the height of R and 2 R respectively, (where R is radius of the earth). The ratio of kinetic energy of A to that of B is

The wavelength of K_(alpha) X-rays produced by an X-ray tube is 1.785 Å. Find the atomic number of the anode material of the tube (R=109737 cm^(-1))

When an electron jumps from the orbit n=2 to n=4, then wavelength of the radiations absorbed will be where, (where R is Rydberg's constant)