Atoms Test - 33...

A beam of $$13.0\space eV$$ electrons is used to bombard gaseous hydrogen. The series obtained in emission spectra is/are

Which of the following is true when Bohr gave his model for hydrogen atom?

Difference between $$nth$$ and $$(n+1)th$$ Bohr's radius of hydrogen atom is equal to $$(n-1)th$$ Bohr's radius. The value of $$n$$ is

The radius of hydrogen atom in the ground state is $$5.3\times10^{-11} m$$. When struck by an electron, its radius is found to be $$21.2\times10^{-11}m$$. The principal quantum number of the final state will be

If elements with principal quantum number $$n>4$$ were not allowed in nature, the number of possible elements would have been

The velocity of an electron in the first orbit of $$H$$ atom is $$'v\ '$$. The velocity of an electron in the second orbit of $$He^+$$ is

How can the rate of emission of electrons in a cathode ray tube can be increased?

In a cathode ray tube, what is the effect on the beam of particles if the anode voltage is increased ?

In a cathode ray tube, what is the effect on the beam of particles if a hotter filament is used ?

State the approximate potential difference applied between the anode and filament cathode ray tube .