Atoms Test - 32...

If the radius of first Bohr orbit is $$r$$, then the radius of second orbit will be

Whenever a hydrogen atom emits a photon in the Balmer series

Two electrons in an atom are moving in orbit of radii $$R$$ and $$9R$$ respectively. The ratio of their frequencies will be

The electron in a hydrogen atom jumps from the ground state to the higher energy where its velocity is reduced to one-third of its initial value. If the radius of the orbit in the ground state is $$r$$, the radius of new orbit will be

The radius of the Bohr orbit in the ground state of hydrogen atom is $$0.5\mathring{A}$$. The radius of the orbit of the electron in the third excited state of $$He^+$$ will be

In the above figure, $$E_1$$ to $$E_6$$ represent some of the energy levels of an electron in the hydrogen atom.
Which one of the following transitions produces a photon of wavelength in the ultra-violet region of the electromagnetic spectrum?

The approximate value of quantum number $$'n\ '$$ for the circular orbit of hydrogen of $$0.0001\space mm$$ in diameter is

How many revolutions does an electron complete in one second in the first orbit of hydrogen atom?

Which of the following parameters are the same for all hydrogen-like atoms and ions in their ground states?

The electric potential energy between a proton and an electron is given by $$U=U_0ln\dfrac{r}{r_0}$$, where $$r_0$$ is a constant. Assuming Bohr's model to be applicable, write the variation of $$'r\ '$$ with $$n$$, $$n$$ being the principal quantum number.