HOMEWORK 1.7 8.3b The speed of a certain electron is 995 km s −1 . If the uncertainty in its momentum is to be reduced to 0.0010 percent, what uncertainty in its location must be tolerated? 8.4b Calculate the energy per photon and the energy per mole of photons for radiation of wavelength (a) 200 nm (ultraviolet), (b) 150 pm (X-ray), (c) 1.00 cm (microwave). 8.7b A laser used to read CDs emits red light of wavelength 700 nm. How many photons does it emit each second if its power is (a) 0.10 W, (b) 1.0 W? 8.8b The work function for metallic rubidium is 2.09 eV. Calculate the kinetic energy and the speed of the electrons ejected by light of wavelength (a) 650 nm, (b) 195 nm. 8.10a Calculate the de Broglie wavelength of (a) a mass of 1.0 g travelling at 1.0 cm s −1 , (b) the same, travelling at 100 km s −1 , (c) an He atom travelling at 1000 m s
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