1. What is the wavelength of light (in nm) if the frequency is 4.2 x 10^14 (1/sec)?
2. What is the wavelength of light (in nm) if the energy of the wave is 2.54 x 10^-19 J?
3. What is the final concentration of a solution if 157-mL of a 3.4-M solution was diluted to 310-mL?
4. What is the final concentration of a solution if 15-mL of a 1.5-M solution was diluted to 100-mL and this process was repeated two more times?