Wavelength of an emission line

Question

Assignment:

Q1. What is the wavelength of an emission line for iron that has a frequency of 5.68×10¹⁴ Hz?

Q2. A solution of CoL³⁺ has a percent transmittance of 28.9 % at 565 nm in a 2.00 cm cell. The molar absorptivity for the complex at this wavelength is 2.45×10⁴ L/(mol?cm). What is the absorbance of CoL3+ in this solution?

Q3. A 2.50 mL aliquot of a solution that contains 3.8 ppm iron (III) is treated with an appropriate excess of KSCN and diluted to 50.0 mL. What is the absorbance of the resulting solution at 580 nm in a 2.50 cm cell? The complex FeSCN₂⁺ has a molar absorptivity of 7.00×103 L cm-1mol-1. (Fe - 55.845 g/mol)

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