You dissolve an amount of solid q in 195.0 ml solvent, forming an unsaturated solution. the solubility of q at 0°c is 1.57 g/100 ml. the amount of solid remaining in solution at 0°c is 23.0% of the original amount of solid dissolved (side question - what is the % what is the original amount of solid that was dissolved (report to 1 decimal place)?

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you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m