Bohr’s model couldn’t explain Zeeman and stark effect.

If Energy = 4.5 KJ; calculate the wavelength.

Find out the wavenumber, when an electron jumps from 2nd orbit to 1st.

Gravitational force = Gm1m2/r2.

What is the ratio of the atomic radius of the 5th orbit in chlorine atom and 3rd orbit in Helium atom?

Elements do emit radiation on their own and this property is known as _____

If the kinetic energy of an electron is 5J. Find out its wavelength.

____ frequency, is the minimum frequency required to eject an electron when photons hit the metal surface.