Atoms Test - 53...

The quantum number corresponding to orbit of diameter 0.0001 mm in hydrogen atom will be nearly (Given that the radius of orbit with n = 1 is $$0.51\times 10^{-10}$$):

How many times does the electron go round the first Bohr orbit in a second?

The radius of the first Bohr orbit of a hydrogen atom is $$ 0.53\times 10^{-10}m$$.When an electron collides with this atom which is in its normal state, the radius of the electron orbit in the atom change to $$2.12 \times 10^{10}m$$.The value of the principal quantum number $$n$$ of the state to which it is excited is:

If energy required to remove one of the two electron from $$\text { He }$$ atom is $$29.5 eV,$$ then what is the value of energy required to convert a helium atom into $$\alpha -$$particle?

Photoelectric effect was successfully explained by 

The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to then (where e, h and c have their usual meanings)

The ratio of the velocity of an electron in the first  Bohr's orbit of the hydrogen atom and the velocity of light is:

If an electron in a hydrogen atom has moved from $$n = 1$$  to  $$n = 10$$ orbit, the potential energy of the system has:

The ratio of the orbit of the $$1st $$ three radii in an atom of hydrogen is 

Ratio of series limit of Brackett and Pfund series of hydrogen ato spectrum is