Per NCERT §photoelectric effect, which of the following classical predictions does the photoelectric effect VIOLATE?
ALight cannot eject electrons
BBelow the threshold frequency ν₀, NO electrons are ejected — regardless of intensity. Classical theory predicted intensity alone should suffice
CElectrons are not ejected at all
DElectrons gain mass on ejection
Answer & Solution
Correct answer: B. Below the threshold frequency ν₀, NO electrons are ejected — regardless of intensity. Classical theory predicted intensity alone should suffice
Per NCERT §photoelectric, even very intense red light fails to eject from K if ν < ν₀; weak yellow light succeeds. Classical EM said brightness alone should matter — falsified.
Related questions
Per NCERT Problem 2.16 (golf ball, mass 40 g, 2% speed uncertainty), why does the uncertaiPer NCERT eqn 2.17, the energy gap ΔE between two stationary states n_i and n_f in hydrogePer NCERT §2.5.2 (significance), what is the key consequence of the uncertainty principle Per NCERT eqn 2.23, Heisenberg's uncertainty principle (1927) states which inequality betwPer NCERT eqn 2.22, the de Broglie wavelength λ of a particle of momentum p (or mass m, vePer NCERT Table 2.3, the LYMAN series (n₁ = 1) of hydrogen lines lies in which spectral rePer NCERT Problem 2.6, what is the energy of one mole of photons of radiation of frequencyPer NCERT eqn 2.7, Einstein's photoelectric equation gives the kinetic energy of an ejecte