Atoms Test - 44...

Given mass number of gold = 197,
Density of gold = 19.7 g/cm$$^3$$
Avogadro's number = $$6  \times 10^{23} $$. The radius of the gold atom is approximately

In an electron gun, the control grid is given negative potential, relative to cathode in order to.

The ratio of the wavelength for $$2\rightarrow 1$$ transition in $${ Li }^{ + },{ He }^{ + }$$ and $$H$$ is :

Which of the following is true?

The ratio of kinetic energy and the total energy of the electron in the nth quantum state of Bohr's atomic model of hydrogen atom is 

If the atom $$^{257}_{100}{Fm}$$ follows the Bohr model and the radius of $$^{257}_{100}{Fm}$$ is n times the Bohr radius, then the value of n is :

The photoelectric effect represent that

The ratio of areas of the electron orbits for the first excited state and the ground state for the hydrogen atom is 

If the series limit of Lymen series for hydrogen atom is equal to the series limit of Balmer series for a hydrogen like atom, then atomic number of this hydrogen like atom is

The adjoining diagram shows the energy levels for an electron in a certain, which transition shown represents the emission of a photon with the maximum energy