Case: Read the passage and answer the question.
Einstein’s photoelectric equation is
\( K_{\max}=h\nu-\Phi \)
where \( \nu \) is the frequency of the incident radiation and \( K_{\max} \) is the maximum kinetic energy of a photoelectron. The work function \( \Phi \) is given as \( \Phi=h\nu_0 \). In terms of the stopping potential \( V_0 \), \( K_{\max}=eV_0 \).
What is the charge on a photon?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → zero (it is electrically neutral)
NCERT (2026-27):
Particle Nature of Light: the Photon – “We can summarise the photon picture of electromagnetic radiation as follows: … (iv) Photons are electrically neutral and are not deflected by electric and magnetic fields.”