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Question
Assertion :The ionising power of β− particle is less compared to α− particles but their penetrating power is more. Reason: The mass of β− particle is less than the mass of α− particle.
Assertion :The ionising power of β− particle is less compared to α− particles but their penetrating power is more. Reason: The mass of β− particle is less than the mass of α− particle.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
α− particles, being emitted with very high speed compared to α− particles, pass very little time near the atoms of the medium.So the probability of the atoms being ionised is comparatively less. But due to this reason, their loss of energy is very slow and they can penetrate the medium through a sufficient depth.
α− particles, being emitted with very high speed compared to α− particles, pass very little time near the atoms of the medium.So the probability of the atoms being ionised is comparatively less. But due to this reason, their loss of energy is very slow and they can penetrate the medium through a sufficient depth.
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