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Question: One Angstrom is equal to. A. \[{10^8}\,{\text{m}}\] B. \[{10^{ - 10}}\,{\text{m}}\] C. \[{10^{...

One Angstrom is equal to.
A. 108 m{10^8}\,{\text{m}}
B. 10−10 m{10^{ - 10}}\,{\text{m}}
C. 10−8 m{10^{ - 8}}\,{\text{m}}
D. 1010 m{10^{10}}\,{\text{m}}

Explanation

Solution

Angstrom is a unit of measurement of very small length. Angstrom unit is used to express the diameter or radius of an atom and also the spacing in atomic lattices.

Complete answer:
We know that Angstrom is a unit of measurement of very small length. We generally use the Angstrom unit to express the diameter or radius of an atom and also the diameter of elementary particles. It is denoted by the symbol A0{A^0} which is a letter in Swedish.

We know that the diameter of the atoms have the value close to multiples of 10−10 m{10^{ - 10}}\,{\text{m}}. Therefore, the unit Angstrom is generally used in physical chemistry.

One Angstrom is equal to 10−10 m{10^{ - 10}}\,{\text{m}}. Hence,option B is the correct answer.

Additional information:
Angstrom unit is named after the Swedish scientist Anders Jonas Angstrom. He depicted the wavelengths of electromagnetic radiations in the Angstrom unit. The wavelengths of radiations are generally expressed in nanometers (nm) but since nm is just 10 times the A0{A^0}, we also use A0{A^0} to express the wavelength. In crystallography, the distance between planes of atoms is expressed in A0{A^0}. We know that for every 10−3 m{10^{ - 3}}\,{\text{m}} multiple of meters, we have a different unit of measurement. That is,
10−3 m=1 mm{10^{ - 3}}\,{\text{m}} = 1\,{\text{mm}}, 10−6 m=1 \mum{10^{ - 6}}\,{\text{m}} = 1\,{\text{\mu m}}, 10−9 m=1 nm{10^{ - 9}}\,{\text{m}} = 1\,{\text{nm}} and10−12 m=1 pm{10^{ - 12}}\,{\text{m}} = 1\,{\text{pm}}.

Note: Not just A0{A^0}, but students should remember every derived S.I unit of the distance measurement. When we express a very small unit in terms ofA0{A^0}, it gets easy while doing calculations. Since 10−9 m=1 nm{10^{ - 9}}\,{\text{m}} = 1\,{\text{nm}}, we can express it as 0.1A0{A^0}, but the units nm and A0{A^0} are used in different ways and we do not correlate them.