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A compound has a strong absorption at 2.11x1016 Hz. What is the λmax( in Å (angstroms))...

A compound has a strong absorption at 2.11x1016 Hz. What is the λmax( in Å (angstroms)) for this compound? ( Write answer in decimal form to one decimal place, for example, if answer is 75.667 then write as 75.7)

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Answer #1

The compound absorbs at a frequency of 2.11 * 10 16 Hz.

So, this has to be interms of wavelength (Ao).

The relation between frequency and wavelength is Frequency = Velocity of light / Wavelength

Frequency = 2.11 * 10 16 Hz. = 2.11 * 10 16 sec-1

Velocity of light = 3 * 10 8 metres. sec-1

Wavelength = 3 * 10 8 metres. sec-1/ 2.11 * 10 16 sec-1 = 1.42 * 10 -8 metres.

1 angstrom = 10 -10 metres

   ??? Angstroms = 1.42 * 10 -8 metres

==> 142 Angstroms = 14.2 nanometres

*** The compound absorbs maximum at the wavelength of 142 Angstroms.

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