6. The 2005 Nobel Prize in physics was given, in part, to scientists who had made ultrashort pulses of light. These pulses are important in making measurements involving very short time periods. A member of the OSU Chemistry faculty, Dr. Chong Fang, currently does research utilizing these very short laser pulses to give real-time structural snapshots of molecules "in action" to investigate reaction mechanisms. One challenge in making such short pulses is the uncertainty principle, which for time and energy can be expressed as AE. At 2 47 a) What is the energy uncertainty associated with a laser pulse whose time uncertainty is 5 femtoseconds (fs)? b) Suppose the lowest energy of the pulse had a wavelength of 722 nm. What is the wavelength of the highest energy of the pulse if it is limited only by the uncertainty principle? 7. The heat of fusion (melting) of ice is 6.00 kJ/mol, meaning it takes 6.00 kJ of energy to convert 1 mole of water in the solid phase at 0C to the liquid phase at 0C. How many photons of light, whose wavelength is 7.55x10m, must be absorbed to melt 1.00 g ice? 1 mole of H20 = 18 g