Photoelectrons are emitted when 400nm radiation is incident on a surface of work function 1.9 eV. These photo electrons pass through a region containing - particles. A maximum energy electron combines with - particle to form a He+ ion, emitting a single photon in this process. He+ ionthus formed are in their fourth exited state.h= 4.14x 10-15 eVs.--What is the energy of photon lying in the 2 to 4 eV range that are likely to be emitted during and after the combination?

Shane Macguire , 10 Years ago

Grade upto college level