Multiple Choice Question Answer XXXXV — task. Science CBSE, Class 9.

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1. Which of the following statements is true ?

A proton is 1/1837 times heavier than an electron.
A proton is 1837 times heavier than an electron.
A proton is 1/1837 times lighter than an electron.
Protons have the same mass as an electron.

2. When alpha particles are sent through a thin metal foil, most of them go straight through the foil because -

Alpha particles move with high velocity.
Alpha particles are much heavier than electrons.
Alpha particles are positively charged.
Most part of the atom is empty.

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