Question

One angstrom is equal to _________.
A. ${10}^{-12}m$
B. ${10}^{-10}m$
C. the time taken by Neil Armstrong to reach the moon
D. the distance travelled by Neil Armstrong on the surface of the moon

Answer 1

Hint: In this question, we need to evaluate the equivalent value of one angstrom in meters. For this, we will try to analyze the value of angstrom and then convert it to meters.

Complete answer:
We can also say that the value of one angstrom is equal to one ten-billionth of one meter. Also, one angstrom is equal to ${10}^{-8}$ centimeters. The angstrom is an internationally recognized unit of length. It is symbolically represented as $$A^{\circ }$$. The value of angstrom is equal to $1\times {10}^{-10}m$. The angstrom is not a part of the S.I. system of units. Still, it is considered as a part of the metric system in general.

So, option B is the correct answer.

Additional Information:
The angstrom symbol is a letter of Swedish alphabet. The unit angstrom is named after Swedish physicist Anders Jones Angstrom. The angstrom is widely used in crystallography, solid state physics as well as in chemistry as a unit for d-spacing, cell parameters, inter atomic distance, and x-ray wavelengths. All these units are often in the range from $1A^{\circ }$ to $10A^{\circ }$.

Note: ${10}^{-10}m$ is also equal to one ten-billionth of a meter, $0.1$ nanometer, or even $100$ picometers. Students get confused when the value is mentioned in different units. The unit is often used to express the sizes of atoms, molecules, microscopic structures, as well as lengths of chemical bonds, arrangement of atoms in crystals, wavelengths of electro-magnetic radiations, and dimensions of the integrated circuit parts.