Question 50
Modern PhysicsIf light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then
- A.no electron will be emitted
- B.the few electrons emitted will have a maximum kinetic energy of 1eV
- C.the few electrons emitted will have a maximum kinetic energy of 3eV
- D.many electrons will be emitted.
Show the answer and explanation
Answer: A (no electron will be emitted)
Explanation
An electron can only escape if the photon energy is at least the work function. 2 eV is less than 3 eV, so no electrons are emitted.