Question

Assertion :Most of the mass of the atom is concentrated in its nucleus.
Reason : All alpha particles striking a gold sheet are scattered in different directions.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (C)

The results of $\alpha$-particle scattering experiment showed that most of the mass of the atom is concentrated in its nucleus. Not all but only high energy $\alpha$-particles are scattered when they strike an extremely thin foil of metal and passing through nucleus.