Atoms Test - 42...

The nuclear radius of $$_{ 4 }^{  }{ { Be }^{ 8 } }$$ nucleus is :

The characteristic spectrum of an atom is observed as

The cathode rays are

Atomic spectrum should be :

According to Rutherford atom model, the spectrum emitted by an atom is :

The ratio of the radii of the first three Bohr Orbits is

In Hydrogen atom, which of the following transitions produces a spectral line of maximum frequency.

The number of de Broglie waves of an electron in the $${ n }^{ th }$$ orbit of an atom is :

In a photon-electron collision ___________.

As the electron in Bohr's orbit of hydrogen atom passes from state $$n=2$$ to, $$n=1$$, the kinetic energy$$(K)$$ and the potential energy $$(U)$$ changes as