Same chapter3 marksDifficulty: Medium
Light of frequency 1015 Hz falls on a metal of work function 2 eV. Find the maximum kinetic energy of the photoelectrons. Take h = 6.63 × 10−34 J s.
Dual Nature of Radiation and Matter
3 marksDifficulty: Medium
State the de Broglie hypothesis and give the expression for the wavelength of a moving particle.
Original Khojo Papers practice question — not from a past board paper.
Answer
The de Broglie hypothesis is that every material particle in motion has a wave associated with it, of wavelength λ = h/mv, where h is Planck's constant and mv the momentum of the particle.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The wavelength of ordinary objects is far too small to detect, but that of an electron is comparable with atomic spacings, which is why electron diffraction is observable.
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The work function of a metal is 2 eV. Find the threshold wavelength. Take h = 6.63 × 10−34 J s and c = 3 × 108 m s−1.
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