science hard mcq

The work function of a metal is the minimum energy required to:

  1. Excite an electron
  2. Remove an electron from the surface
  3. Ionize an atom
  4. Break a chemical bond

Answer: Remove an electron from the surface

Work function (φ) is the threshold energy for photoelectric emission. Einstein's equation: K_max = hν - φ. Central to quantum explanation of photoelectric effect. [[NCERT Physics Class 12]]

Topic Physics - Modern Physics
Exam Relevance UPSC CSE, SSC Scientific Assistant, CSIR NET

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