4. The blue color in some fireworks occurs when copper(I) chloride is heated to approximately 1500 K and emits blue light of wavelengths 4.50 x 10^7 m. How much energy does one photon of this light carry?
Hint: use the relationship between the energy of a photon, Planck's constant, the speed of light, and the wavelength.
5. Calculate the energy possessed by a single photon of the following type of electromagnetic radiation: frequency 5.23 x 10^20 s-1
