The value of one angstrom is:
2019
The value of one angstrom is:
- A.
10-1 micron
- B.
10-2 micron
- C.
10-4 micron
- D.
10-6 micron
Attempted by 8 students.
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Correct answer: C
SI prefixes convert a length into a ratio relative to the metre: the micro- prefix (μ) always means 10-6 of the base unit, while the angstrom is a fixed non-SI unit of length defined as 10-10 metre. Converting between any two metric-scale units is just a matter of comparing these powers of ten.
Write each unit in metres: 1 angstrom (Å) = 10-10 m; 1 micron (μm) = 10-6 m.
Divide to get the ratio: 1 Å in microns = 10-10 m ÷ 10-6 m per micron = 10-4 micron.
So one angstrom equals 10-4 micron.
Cross-check via the nanometre: 1 Å = 0.1 nm = 10-1 nm, and since 1 micron = 1000 nm, 10-1 nm ÷ 1000 = 10-4 micron — the same result, consistent with NIST's SI unit conversion tables.