alleryThe minimum energy needed to free an electron from a metal is its:
AWork function
BKinetic energy
CStopping value
DThreshold power
Answer & Solution
Correct answer: A. Work function
1. Electrons are bound inside the metal surface.
2. Some energy must be supplied before one can escape.
3. That minimum is the work function.
4. So the answer is work function.
_Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_
Keep practising Dual Nature of Radiation and Matter
Browse all Dual Nature of Radiation and Matter questions for AP Intermediate 2nd Year, or explore more Physics topics.
Related questions
However intense the light, no emission occurs below the:The minimum energy needed to free an electron from a metal is its:Order the photoelectric storyPhotoelectric current falls to zero at which voltage?The de Broglie relation contains a wave concept together with a:The momentum carried by a photon of wavelength $\lambda$ isSet by intensity or by frequency?The de Broglie wavelength of a fast electron is comparable with: