Assertion : $α$ -particles tracks as observed in a cloud chamber are much shorter than $β$ -particle tracks though they emerge from a radioactlve sample with almost same speed. Reason: The masses of alpha particles are greater than the masses of $β$ -particles.

Statement I is True and Statement 2 is True and is a correct explanation of Statement 1.

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Statement I is True and Statement 2 is True but not a correct explanation of Statement 1.

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Statement I is True and Statement 2 is False

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Statement I is False and Statement 2 is True.

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Solution

The correct option is B Statement I is True and Statement 2 is True but not a correct explanation of Statement 1.
The Alpha particles have a big mass and charge of $+ 2.$ This means they cause lot of ionisation in short distance. Each time it rips an electron it loses its energy and slows down a bit. An $α - p a r t i c l e$ might make $100000$ ionisation before losing its energy at a very short distance. This is why cloud trails are short and fat and vice-versa and applies for electron or $(β - p a r t i c l e s)$ and it is pretty obvious that the statement-2 is true but is not the correct reason for statement-1.

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Assertion :α-particles tracks as observed in a cloud chamber are much shorter than β-particle tracks though they emerge from a radioactlve sample with almost same speed. Reason: The masses of alpha particles are greater than the masses of β-particles.

Assertion : $α$ -particles tracks as observed in a cloud chamber are much shorter than $β$ -particle tracks though they emerge from a radioactlve sample with almost same speed. Reason: The masses of alpha particles are greater than the masses of $β$ -particles.