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The wrong unit conversion among the following is
$1$ angstrom $= 10^{- 10} m$
$1$ fermi $= 10^{- 15} m$
$1$ light year $= 9.46 \times 10^{15} m$
$1$ astronomical unit $= 1.496 \times 10^{- 11} m$

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$1$ angstrom $= 10^{- 10} m$

$1$ fermi $= 10^{- 15} m$

$1$ light year $= 9.46 \times 10^{15} m$

$1$ astronomical unit $= 1.496 \times 10^{- 11} m$

answer is D.

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Detailed Solution

$1$ Astronomical unit $= 1.496 \times 10^{11} m$

All the other unit conversions are correct.

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