Based on which experiment did the Rutherford nuclear model come from?
Ernst Rutherford was engaged in experiments on $\alpha$-particles emitted by some radioactive elements and explanation of the results gave an explanation of the atomic model.
According to this the entire positive charge and most of the mass of the atom is concentrated in small volume called the nucleus with electron revolving around the nucleus just as planets revolve around the Sun which is also called planetary model of atom or Rutherford nuclear model which we have accepted today.
However, it could not explain why atoms emit light of only discrete wavelengths. For example, how could an atom as simple as hydrogen, consisting of a single electron and a single proton, emit a complex spectrum of specific wavelengths?
The radius of the smallest electron orbit in hydrogen-like ion is $(0.51/4 \times 10^{-10})$ metre; then it is
In 1911 , the physicist Ernest Rutherford discovered that atoms have a tiny, dense nucleus by shooting positively charged particles at a very thin gold foil. A key physical property which led Rutherford to use gold was that it was
The ratio of speed of an electron in ground state in Bohrs first orbit of hydrogen atom to velocity of light in air is
According to classical theory, the circular path of an electron in Rutherford atom is
In a hydrogen atom, the electron is in $n^{th}$ excited state. It may come down to second excited state by emitting ten different wavelengths. What is the value of $n$ :