Length cannot be measured by

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Accepted Answer

1. **Analyze Option A (Fermi):** The Fermi (or femtometre) is a unit of length used to measure nuclear dimensions. $1 	ext{ Fermi} = 1 	ext{ fm} = 10^{-15} 	ext{ m}$ .
2. **Analyze Option B (Debye):** The Debye (D) is a non-SI unit of electric dipole moment. $1 	ext{ D} \approx 3.33564 	imes 10^{-30} 	ext{ C m}$ , . It is not a unit of length.
3. **Analyze Option C (Micron):** The Micron (micrometre) is a unit of length. $1 	ext{ micron} = 1 \mu	ext{m} = 10^{-6} 	ext{ m}$ .
4. **Analyze Option D (Light year):** The Light year is a unit of length used to measure large astronomical distances. It is the distance light travels in one year, approximately $9.46 	imes 10^{15} 	ext{ m}$ , .
5. **Conclusion:** Among the given options, Debye is the only unit that does not measure length.

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