Nuclei Test - 2...

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

$$20$$% of a radioactive element disintegrates in $$1hr$$.The percentage of the radioactive element disintegrated in $$2hrs$$ will be

Assertion (A) : Isotopes of an element can be separated by using a mass spectrometer.
Reason (R) : Separation of isotopes is possible due to difference in electron number of isotopes.

Consider the following statements (A) and (B) and identify the correct answer given below :
Statement A: Positive values of packing fraction implies a large value of binding energy
Statement B: The difference between the mass of the nucleus and the mass number of the nucleus is called the packing fraction

True masses of neutron,proton and deutron in $$a.m.u$$ are $$1.00893, 1.00813$$ and $$2.01473$$ respectively. The packing fraction of the deutron in $$a.m.u$$ is

$$4.6\times 10^{22}$$ atoms of an element weight $$13.8$$ g. What is the atomic mass of the element?

When the mass of an electron becomes equal to thrice its rest mass, its speed is

Assertion (A) : If a heavy nucleus is split into two medium sized parts,each of the new nuclei will have more binding energy per nucleon than the original nucleus.

An electron moves with a speed of $$\dfrac{\sqrt{3}}{2}c$$. Then its mass becomes_____ times its rest mass. (Given velocity of light $$=c$$)

Assertion (A): Nuclear fusion reactions are considered as thermo-nuclear reactions