Nuclear Physics And Radioactivity Question 9
Question: Assertion : The positively charged nucleus of an atom has a radius of almost $ {{10}^{-15}}m. $ Reason : In a-particle scattering experiment, the distance of closest approach for a-particles is ≃ $ {{10}^{-15}}m. $
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: A
Solution:
In a-particle scattering experiment, Rutherford found a small number of a-particles which were scattered back through an angle approaching to $ 180{}^\circ $ . This is possible only if the positive charges are concentrated at the centre or nucleus of the atom.
BETA
