Question:
The work function of caesium metal is 2.14 eV. When light of frequency 6 x1014Hz is incident on the metal surface, photoemission of electrons occurs. What is the (a) maximum kinetic energy of the emitted electrons, (b) Stopping potential, and (c) maximum speed of the emitted photoelectrons?
Answer:
3) from de-broglies wave equation wave lenght = plank's constant / momentum -----------------------------(1)
we know that from thershold frequency lamda=hc/work function--------------------------------------(2)
sub (2) in (1)
then momentum = m*v ( v is velocity)
v=hc/work function
sooo
v=
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