Nuclei Test - 6...

An electron collides with a fixed hydrogen atom in its ground state. Hydrogen atom gets excited and the colliding electron loses ail its kinetic energy. Consequently the hydrogen atom may emit a photon corresponding to the largest wavelength of the Balmer series. The min. K.E. of colliding electron will be

P and Q are two elements which form $${ P }_{ 2 }{ Q }_{ 3 }$$ and $${ PQ }_{ 2 }$$. If 0.15 mole of $${ P }_{ 2 }{ Q }_{ 3 }$$ weight 15.9 g and 0.15mole of $${ PQ }_{ 2 }$$ weight 9.3 g. what are atomic weights of P and Q respectively?

$$_{92}U^{238}$$ on absorbing a neutron goes over to $$_{92}U^{239}$$. This nucleus emits an electron to go over to neptunium which on further emitting an electron goes over to plutonium. The plutonium nucleus can be expressed as:

A nucleus $$_Z{X}^A$$ emits $$9 \alpha$$-particles and $$5p$$ particle. The ration of total protons and neutrons in the final nucleus is:-

If $$_{ a }^{ b }{ X }$$ emits a positron, two $$\alpha $$ and two $$\beta^- $$ and in last one $$\alpha $$ is also emitted and converts in  $$_{ d }^{ c }{ Y }$$, correct relation:

If the binding energy per nucleon in $$_{3}^{7}Li$$ and $$_{2}^{4}He$$ nuclei are $$5.60\ MeV$$ and $$7.06\ MeV$$ respectively, then in the reaction : $$p + _{3}^{7}Li \rightarrow 2_{2}^{4}He$$ energy of proton must be

For a nucleus to be stable, the correct relation between neutron number N and proton number Z is 

Let $$u$$ denote one atomic mass unit. One atom of an element of mass number $$A$$ has mass exactly equal to $$Au$$

If half-life of a radioactive substance is $$60$$ minutes, then the percentage decay in $$4$$ hours is?

In a hydrogen atom, the binding energy of the electron in the ground state is $$E_{1}.$$ Then the frequency of revolution of nth electron in the nth orbits is