Photoelectrons from a material whose work function is 2.31 eV are ejected by 477 nm photons. Once ejected, how long does it take these electrons (in ns) to travel 2.35 cm to a detection device? ns

s) The cutoff frequency of a specific metal is known to be 0.72x1015Hz. During a photoelectric experiment, 3.7x102º photons with a wavelength of 167nm are striking a plate every second. What is the power of the photons and what is the maximum kinetic energy of the ejected electrons?

A positron of mass m and kinetic energy egual to thrice its mass collides with an electron at rest. Two high-energy photons are created as they annihilate each other. One photon enters a detector placed at an angle of 90° with respect to the direction of the incident electron. What is the value of 0 of the second photon? Note: Both electron and positron have mass m. E , P. m m E.Pa d 90° a b E4, Pa BEFORE AFTER