Competitive Thinking

Rutherford's $\alpha$-particle experiment showed that the atoms have 

Hydrogen atom in the ground state is excited by a monochromatic radiation of $\lambda =975 \mathrm{A}$ . Number of spectral lines in the resulting spectrum emitted will be.
 

The ionization energy of hydrogen is $13.6 \mathrm{eV}$ . The energy of the photon released when an electron jumps from the first excited state $(n=2)$  to the ground state of a hydrogen atom is.

When an $\alpha$-particle of mass  $m$ moving with velocity $v$ bombards on a heavy nucleus of charge '$Ze$', its distance of the closest approach from the nucleus depends on $m$ as.
 

The de-Broglie wavelength of thermal neutrons at $27°\mathrm{C}$ will be.

The energy released by the fission of one uranium atom is $200 \mathrm{MeV}$. The number of fission per second required to produce $6.4 \mathrm{W}$ power is.

The number of de-Broglie wavelengths contained in the second Bohr orbit of the hydrogen atom is.
 

Match List-I (Fundamental Experiment) with List-II (its conclusion) and select the correct option from the choices given below the list: