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Assertion nm is not same as mN Reason \( \ln m=10^{-9} m \operatorname{and} 1 m N=10^{-3} N \)

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Correct answer: Assertion is correct but Reason is incorrect

Solution

The assertion is correct because "nm" and "mN" represent different units: nanometer and millinewton. The reason is incorrect because the prefix conversions are misstated; nano means 10^-9 and milli means 10^-3, but the written expressions do not correctly define the units as given.

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