A metallic surface has a threshold frequency of 3.60 x 10^14 Hz. A photon that has an energy of 2.80 x 10^19 J is incident on this surface, The maximum velocity of the emitted electrons, expressed in scientific notation, is a.bc 10^ d . Thevalues of a, b, c, and d are NEXT QUESTION- An X-ray photon that has a wavelength of 1.576 10^10 m collides with a stationary electron. The scallered X-ray photon, which has a wavelength of 1.625 10^ -10 m, returns along the initial path. Determine the degree that the electron is deflected at and identify if this collision has reached maximum wavelength change for this collision. 90; yes - at maximum wavelength change 270; no - need shorter initial wavelength 180; yes - at maximum wavelength change 180: no - need longer initial wavelength PLEASE HELP ME ASAP I HAVE LITTLE TIME