Which one of the following is the correct relation between Å and nm?

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1 nm = 10⁻¹ Å

1 nm = 10 Å

1 nm = 1 Å

1 nm = 10⁻² Å

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This question was previously asked in

UPSC NDA-2 – 2018

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The Angstrom (Å) is a unit of length equal to 10⁻¹⁰ meters. The nanometer (nm) is a unit of length equal to 10⁻⁹ meters. To find the relation between them, we can write 1 nm = 10⁻⁹ m = 10¹ × 10⁻¹⁰ m = 10 × (10⁻¹⁰ m) = 10 Å. Therefore, 1 nm = 10 Å.

This question tests the knowledge of common units of length used in physics and chemistry, particularly at the atomic and molecular scales, and the ability to convert between them based on their definitions in terms of meters.

The Angstrom unit, though not part of the SI system, is widely used, especially in crystallography and spectroscopy. The nanometer is an SI unit and is commonly used in nanotechnology and measuring wavelengths of visible light.

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