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Between 1 nanometre and 1 micrometre (= 1000 nm).
1.85 x 10^-1 nm
It is: 4.0*10^2 nm
0.278 nm = 0.000278 µm
400 km = 4*1014 nm
When a protein in solution is analyzed using UV-visible, a peak at 280 nm is commonly observed. This peak is due to the effect of aromatic rings in the polypeptide chain (from amino acids tryptophan and tyrosine).
510 nm
Tyrosine and tryptophan
454 nm
427nm plus or minus 3 nm.
thymol blue 436, 545 and 595 nm
Hypericin salts are red in organic solvents and show a typical absorbance at 590 nm, which is useful to quantify hypericin in the drug extracts
A = Elc A = (6220 M^-1 cm^-1)x(1 cm)x(0.01 M) A = 62.2 (units cancel, so no units in absorbance)
276 nm
ANSWER13,161 feet tall
The UV absorbance over 190 nm is not significant because diethyl ether hasn't aromatic rings..
Different substances have their characteristic behavior for different wavelengths; I assume caffeine easily absorbs that particular frequency.