Photoelectric Experiment Challenge
25 NEET-standard questions on the photoelectric experiment: intensity, saturation current, stopping potential, threshold frequency, no time lag, and where the wave picture fails. Answer each one. If you get it wrong, Vidya Ma’am explains it with an animated movie you can control, a slider to play with, and a step-by-step solution. Then try again.
NCERT Physics XII Part II · Ch. 11 · pp. 277–281Keys: A–D or 1–4 to answer
🧠 Formula memory tricks (open before you start)
Intensity vs frequencyIntensity sets the number of electrons per second (saturation current). Frequency sets their energy (V₀).
Stopping potentialKmax = eV₀Kmax in eV = V₀ in volts
PhotocurrentI = n eelectrons per second n = I ÷ e
V₀ – ν lineStraight line, x-intercept ν₀, slope h/eV₀ = (h/e)(ν − ν₀)
ThresholdBelow ν₀: no emission, however intense.
No lagEmission within ≈10⁻⁹ s, even for dim light.
Wave picture failsKmax would grow with intensity, no threshold, long delay: none is seen.
right first tryfixed after explanationstill to fix
Made for NEET students · Progress is saved in this browser · SAMPLE build: voice recording pending