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When alpha particle are sent through a ...

When alpha particle are sent through a thin metal foil ,most of them go straight through the foil because

A

alpha particles are much heavier than electrons

B

alpha particles are positively charged

C

most part of the atom is empty space

D

alpha particles move with high velocity

Text Solution

Verified by Experts

The correct Answer is:
A, C
Alpha particles passes mostly undeflected when sent through thin metal foil mainly, because
(i) it is much heavier than electrons.
(ii) most part of atom is empty space.
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Assertion (A) : In Rutherford's experiment, alpha particles from a radium source were allowed to fall on a 10^(-4)mm thick gold foil. Most of the particles passed straight through the foil. Reason (R) : The entire positive charge and nearly whole of the mass of an atom is concentrated in the nucleus.