1. A photon with a wavelength of 4.52 nm strikes a surface and emits an electron with kinetic energy of 177 eV (electron volts). What is the binding energy of the electron in J?

1 electron volt = 1.602 x 10^-19 J

2. Electrons are observed as particles or waves depending on:

what experiment is performed

the location of the experiment

their mood

what atom they are in

3. Calculate the de Broglie wavelength of a 142 g ball traveling at 38.74 m/s. Assume the ball can be modeled as a single particle. Give your answer to 3 sig figs.