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Answer the following questions showing all work.
1. What is the frequency of light if the energy is 9.56E-19J ?
2. What is wavelength (in nm) of light if it has a frequency of 6.45E14 Hz?
3. What is energy of light that has a wavelength of 493nm?
4. What is the wavelength of light that has an energy of 7.45E-19J ?