Calculate the orbital period in each of these levels.

Calculate the number of atoms in each of the following 52 u of He

Calculate the number of atoms in each of the following 52 g of He

Calculate the number of atoms in each of the following 52 moles of Ar

Calculate the difference in energies of two levels between which a transition of wavelength 4000^o A takes place.

Calculate the radius of the 3^(rd) orbit of the electron in hydrogen atom

Calculate the period of revolution of a polar satellite orbiting close to the surface of the Earth.

Calculate the speed and period of revolution of a satellite orbiting at a height of 700 km above the earth's surface. Assume the orbit to be circular. Take radius of earth as 6400 km and g at the centre of earth to be 9.8 m//s^2

The velocity of the electron in the 1st Bohr orbit has a radius 0.53 A^@ is 2200 km//s . Calculate the frequency of revolution of the electron in the same orbit.

Calculate the frequency of revolution of the electron in the first Bohr orbit of H-atom, if the radius of the 1st Bohr orbit is 0.50 A^@ and the velocity of electron in the first orbit = 2.24 xx 10^6 m//s .