Calcualte the ratio of the radius of 2nd orbit of H atom and that of 3rd orbit.

State Bohr’s postulates for atomic modeland using them derive an expression for the radius of nth orbit in hydrogen atom and show that radii are in the ratio 1 : 4 : 9 :16 :..........

The ratio of the radius difference between 4^(th) and 3^(rd) orbit of H-atom and that of Li^(2+) ion is :

Calculate the radius of third orbit of hydrogen atom. Compare it with the same radius of second Bohr orbit of singly ionised helium atom.

If epsilon_(0) be the permittivity of vacuum and r be the radius of orbit of H- atom in which electron is revolving, then velocity of electron is given by :

Read the following statements and choose the correct option. (I) If the radius of the first Bohr orbit of hydrogen atom us redis of 2^(nd) orbit of Li^(2+) would be 4r (II) For s-orbital electron , the orbital angular momentum is zero

Write down the expression for the radii of orbits of hydrogen atom.Calculate the radius of the smallest orbit.

Calculate the frequency of rtevolution of electron in the first Bohr orbit of hydrogen atom,if the radius of the first Bohr orbit is 0.5 overset @A and the velocity of electron in the first orbit is 2.24 xx 10^6 m s^(-1) .

Radius of the earth is 6400 km. Theradius of the orbit of a stationary satellite is about