Which spectral series does not lie in the spectrum of hydrogen atom? 

 

What is the de Broglie wavelength of a bullet of mass $0.040 \mathrm{Kg}$ travelling at the speed of $1.0 \mathrm{Km}/\mathrm{s}$?

According to Rutherford's experiments, the size of nucleus is about :
 

What is the de Broglie wavelength of a ball of mass $0.060 \mathrm{Kg}$ moving at a speed of $1.0 \mathrm{m}/\mathrm{s}$?