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NEET PHYSICSEasy

Length cannot be measured by

A

Fermi

B

Debye

C

Micron

D

Light year

Step-by-Step Solution

  1. Analyze Option A (Fermi): The Fermi (or femtometre) is a unit of length used to measure nuclear dimensions. 1 Fermi=1 fm=10−15 m1 \text{ Fermi} = 1 \text{ fm} = 10^{-15} \text{ m} .
  2. Analyze Option B (Debye): The Debye (D) is a non-SI unit of electric dipole moment. 1 D≈3.33564×10−30 C m1 \text{ D} \approx 3.33564 \times 10^{-30} \text{ C m} , . It is not a unit of length.
  3. Analyze Option C (Micron): The Micron (micrometre) is a unit of length. 1 micron=1μm=10−6 m1 \text{ micron} = 1 \mu\text{m} = 10^{-6} \text{ 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 9.46×1015 m9.46 \times 10^{15} \text{ m} , .
  5. Conclusion: Among the given options, Debye is the only unit that does not measure length.
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