Polycrystalline silver (Ag) has a work function of 4.26 eV . Light of wavelength 200 nm and intensity 1 W/m2 shines onto a 1.2 cm by 1.2 cm cleaned surface of polycrystalline silver. a) Determine the number of electrons ejected each second, and b) the kinetic energy of each ejected electron.

Calculate the energy per mole of photons for the laser used in Blu-ray players ( = 405 nm)

The Doppler effect is one of the sources of the line broadening in atomic absorption spectroscopy. Atoms moving toward the light source encounter higher-frequency radiation than atoms moving away from the source. The difference in wavelength experienced by an atom moving at speed v (compared to one atrest) is / = v/c , where c is the velocity of light. Estimate the line width (in nanometers) of the lithiumline at 670.776(6707.76 Å) when the absorbing atoms are at a temperature of (a) 2000 K and (b) 3120 K.The average speed of an atom is given by v=8kT/m , where k is Boltzmann’s constant, Tis the absolute temperature, and m is its mass.

(a) Calculate the frequency and the wavelength of the line for the n = 6 to n = 4 transition. (b) Is this wavelength longer or shorter than that of the n = 7 to n = 4 transition?