1.The wavelength of the spectral lines of the Brackett series of hydrogen atom are in the region

2.A neutral atom has two electrons in K-shell, eight electrons in L-shell and six electrons in M-shell. The total number of s-electrons is

3.According to Rutherford atom model, an atom is

4.Planck’s constant is equal to

5.Lines of Paschen series are obtained from the hydrogen atom when the electron jumps from any higher orbit to