Q. 154.5( 2 Votes )

In the study of G

Answer :


From the following experiment, following are observed:


(1) Most of the alpha particles pass straight through the gold foil. It means that they do not suffer any collision with golf atoms.


(2) About one alpha particle in every 8000 alpha particles deflects by more than 90°.
As most of the alpha particles go un-deflected and only a few get deflected, this shows that most of the space in an atom is empty and at the centre of the atom, there exists a nucleus. By the number of the alpha particles deflected, the information regarding size of the nucleus can be known.
If m is the average mass of a nucleon and R is the nuclear radius, then mass of nucleus = mA, where A is the mass number of the element.





Density of nuclear matter,




This shows that the nuclear density is independent of A.


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