Sub-topic 1
2026 · National One-Eighth
Free
The photoelectric effect: factor determining photoelectric current (light intensity / photon flux)
Read past contest →
Sub-topic 2
2026 · National Preliminary
Premium
Threshold wavelength for the photoelectric effect from work function
Read past contest →
Sub-topic 3
2026 · National Preliminary
Premium
Threshold frequency for the photoelectric effect from work function
Read past contest →
Sub-topic 4
2026 · National Preliminary
Premium
Threshold frequency for the photoelectric effect from work function
Read past contest →
Sub-topic 5
2026 · National Preliminary
Premium
Thermionic emission of electrons from a heated metal
Read past contest →
Sub-topic 6
2026 · National Preliminary
Premium
Thermionic emission of electrons from a heated metal
Read past contest →
Sub-topic 7
2025 · National Preliminary
Premium
Maximum kinetic energy of photoelectrons from einstein's photoelectric equation
Read past contest →
Sub-topic 8
2025 · National Preliminary
Premium
Maximum kinetic energy of photoelectrons from einstein's photoelectric equation
Read past contest →
Sub-topic 9
2026 · National Quarterfinal
Premium
Physical quantities governing the rate of thermionic emission
Read past contest →
Sub-topic 10
2026 · National One-Eighth
Premium
Photoelectric effect: factor determining photoelectric current
Read past contest →
Sub-topic 11
2018 · National One-Eighth
Premium
Photoelectric effect: fastest electron speed (case 1)
Read past contest →
Sub-topic 12
2018 · National One-Eighth
Premium
Photoelectric effect: fastest electron speed (case 2)
Read past contest →
Sub-topic 13
2021 · National Preliminary
Premium
Photoelectric effect: intensity, frequency and photoelectron count (true/false)
Read past contest →
Sub-topic 14
2024 · Regional Championship
Premium
Work function of a photocathode from photon energy and maximum photoelectron kinetic energy
Read past contest →
Sub-topic 15
2022 · National Preliminary
Premium
True or false: in the photoelectric effect, excess photon energy is scattered as lower-energy photons
Read past contest →
Sub-topic 16
2022 · National Preliminary
Premium
True or false: in the photoelectric effect, a bound electron's ke equals the full photon energy
Read past contest →
Sub-topic 17
2022 · National Preliminary
Premium
True or false: in the photoelectric effect, a free electron dissipates leftover photon energy as heat
Read past contest →