Chemistry Help?

The Color of light depends on its wavelength. The longest visible rays, at the red end of the visible spectrum are 0.000078 cm. in length. Express the length in microns and in angstroms.

Answer:
1 cm = 10^4 microns
So 0.000078 cm = 0.000078 x 10^4 = 0.78 microns

1 cm = 10^8 Angstroms
So 0.000078 cm = 0.000078 x 10^8 = 7800 Angstroms
.78 microns 7800 Angstroms

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