Atoms Test - 59...

According to Bohr hydrogen atom model the radius of stationary orbit directly proportional to principal quantum number n as $$\rightarrow $$

The nuclear radius of a certain nucleus is  $$7.2 f m $$  and it has a charge of  $$1.28 \times 10 ^ { - 17 } { C }.$$  The number of neutrons inside the nucleus is

The ratio of the kinetic energy to the total energy of an electron in a Bohr orbit is

According to Bohr's hypothesis , the angular momentum of the electron on any stationary orbit of radius r is proportional to ......

An electron of H-atom de-excites from energy level $$n_1=2$$ to $$n_2=1$$ and the emitted photon is incident on $$He^+$$ ions in ground and first excited state. Which of following transition is possible.

Find the average of radius for $$A{u^{197}}$$.

The size of an atom is of the order of

The energy level diagram for an hydrogen like atom is shown in the figure.The radius of its first Bohr orbit is 
0 eV ____________n = $$\infty  $$
  -6.04 eV __________ n = 3 
 -13.6 eV ____________ n =2 
 -54.4 eV ____________ n=1

If $$ '\lambda ' $$ the longest wavelength of Lyman series, then shortest wavelength line that of the Balmer series is:-

According to Bohr's theory, the product of velocity of electron in $$ n^{th} $$ orbit and the radius of $$ n^{th} $$ orbit is: