Nuclei Test - 4...

Which of the following assertions are correct?

In a Bainbridge mass spectrometer positive rays of the same element produce different traces. The traces correspond to:

When the radioactive isotope $$_{88}Ra^{226}$$ decays in a series by emission of three alpha$$(\alpha)$$ and a beta $$(\beta)$$ particle, the isotope X which remains undecay is?

Mass defect for the helium nucleus is $$0.0303\ amu$$. Binding energy per nucleon for this (in $$MeV$$) will be_______

Which  of the following nucleus is fissionable by slow neutrons: 

An unknown stable nuclide after absorbing a neutron emits an electron, and the new nuclide splits spontaneously into two alpha particles. The unknown nuclide can be

A radioactive nucleus of mass $$M$$ emits a photon of frequency $$v$$ and the nucleus recoils. The recoil energy will be:

A $$\gamma$$ ray photon produces an electron positron pair. If the rest mass energy of electron is $$0.51\ Mev$$ and the total kinetic energy of electron - positron pair is $$0.78\ MeV$$ then the energy of $$\gamma$$- ray photon is $$Mev$$ is

A nuclear transformation is denoted by $$X(n, \alpha)_{3}^{7}Li$$. Which of the following is the nucleus of element $$X$$?

Rn decays into Po by emitting an $$\alpha$$  particle with half life of 4 days. A sample contains $$6.4\ \times \ { 10 }^{ 10 }$$ atoms of Rn. After 12 days, the number of atoms of Rn left in the sample will be