Discussion
Assertion (A): A condensation nucleus concentration must be quoted with a supersaturation.
Reason (R): The number of particles that activate depends on the supersaturation applied.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the necessity. Every particle has its own critical supersaturation, so the number that activate rises with the supersaturation applied - the count at 1 per cent may be several times the count at 0.1. A figure quoted without the supersaturation is therefore uninterpretable, which is why instruments report a spectrum rather than a single number.
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