In the photoelectric effect, electrons should be removed from the

Question

BlackTom AI · Accepted Answer

Photoelectric effect ejects electrons from the surface of a material — specifically the outer (valence) electrons.

1. Relevant knowledge points and concepts
- The photoelectric effect occurs when photons transfer energy to electrons in a material so those electrons escape the material’s surface.
- Key relation: hν = φ + KEmax, where hν is photon energy, φ (work function) is the minimum energy to remove an electron from the surface (usually a valence/outer electron), and KEmax is the kinetic energy of the emitted electron.
- Valence (outer) electrons have the lowest binding energies and are therefore most easily removed by visible/ultraviolet photons. Core/inner electrons are tightly bound and require much higher-energy photons (e.g., X-rays).

2. Step-by-step reasoning
- A photon arrives and interacts with an electron.
- If the photon energy hν is less than the work function φ, no electron is emitted.
- If hν ≥ φ, an electron can be emitted; because φ corresponds to removing an electron from the surface/outer shell, the electrons involved are outer (valence) electrons.
- The excess energy becomes the electron’s kinetic energy (KE = hν − φ).

3. Intermediate steps / equations
- Condition for emission: hν ≥ φ.
- Kinetic energy of emitted electron: KEmax = hν − φ (if hν > φ).

4. Why the correct answer is correct
- Outer (valence) electrons are weakly bound and located at or near the surface, so typical photon energies used in photoelectric experiments can overcome their binding energy (φ). Thus photoemission primarily removes outer-shell electrons.

5. Why the other options are incorrect
- b. “from core” and c. “inner shells”: Core/inner electrons have much larger binding energies; removing them requires much higher-energy photons (X-ray photoemission), not the ordinary photoelectric effect.
- d. “the nucleus”: The nucleus contains protons and neutrons and is not the source of electrons; it cannot be “removed” via the photoelectric effect.

6. Conclusion
- Therefore, electrons removed in the photoelectric effect come from the outer shells (choice a), which matches the provided correct answer.

In the photoelectric effect, electrons should be removed from theSingle choice

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