Atoms and Nucle...

If the series limit of Lymen series for Hydrogen atom is equal to the series limit of Balmer series for a hydrogen like atom, then atomic number of this hydrogen like atom will be

Two protons are kept at a separation of 40Å. F_n is the nuclear force and F_e is the electrostatic force between them. Then,

When a hydrogen atom is bombarded, the atom is exicted to the n = 4 state. The energy released, when the atom goes from n = 4 state to the ground state is

The Fig. indicates the energy levels of a certain atom. When the system moves from 2 E level to E, a photon of wavelength λ is emitted. The wavelength of photon produced during its transition from 4E/3 level to E is

The nucleus at rest disintegrate into two nuclear parts which have their velocities in the ratio 2 : 1 The ratio of their nuclar sizes will be

In each of the following question match column -I and `column -II select correct

Assertion :- In a radio-active disintegration, an election is emitted by nucleus.
Reason :- eleccon are always Present in-side the nucleus.

Assertion :- An election and Positon can annibilate each other creating Photon.
Reason :- Electon and Positon form a Particle and anti Particle.

Assetion :- An isolated radioactive atom may not decay at all what ever be its half time
Reason :- Radioactive decay is a statistical Phenomena.

Assertion :- Fragment Produced in the fission of u235 are active Reason :- The fragments have abnormally high Proton to neutron ratio