12 past paper questions on optical phenomena from NSC, 2021–2026. Read what each one asks, then open it with its memo.
9 questions on optical phenomena. Each opens in the question browser with its memo.
Light of varying energy strikes a metal plate. Define work function, determine the gradient of the kinetic energy-photon energy graph, calculate maximum photoelectron speed and photon energy for a specific condition, and explain whether increasing the photon count affects maximum kinetic energy.
Photoelectric cell with cathode of known work function. State evidence from the photoelectric effect, define work function, calculate maximum electron kinetic energy at given frequency, determine minimum photon count over 10 seconds, and analyze how light intensity affects ammeter current.
A multiple-choice question identifying the correct definition of the photoelectric effect from four options involving photon absorption and electron emission from metal surfaces.
A multiple-choice question relating line absorption spectra to energy transitions in atoms, identifying which combination correctly describes energy direction and the appearance of narrow spectral lines.
Define the photoelectric effect and calculate maximum electron speed ejected from caesium when illuminated by light of known wavelength and threshold frequency. Explain a negatively charged zinc electroscope's behavior when exposed to ultraviolet and green light relative to threshold frequency.
Graphs of kinetic energy versus frequency for two metals. Calculate the gradient and metal A's work function, find an unknown kinetic energy value, analyze how intensity and frequency affect kinetic energy and photoelectron emission rate, and compare metal B's larger work function.
Identify an unknown metal using photoelectric data. A graph relates electron velocity squared to photon energy. Define work function, use calculations to identify the metal from a work-function table, calculate an unknown value, and explain how light intensity affects maximum electron velocity.
A multiple-choice question distinguishing between emission and absorption spectra using diagrams showing light passing through hot gas, cold gas, and prism dispersion.
Photoelectric cells with cathodes M and N produce frequency versus kinetic energy graphs with different characteristics. Define threshold frequency, compare kinetic energies at specific frequencies, calculate an unknown threshold frequency value, and determine how increased light intensity affects kinetic energy, photoelectron rate, and graph y-intercept.
3 exam pages where optical phenomena appears alongside other topics — multiple-choice pages, and pages where one question ends and the next begins. Listed in full so nothing is hidden.
Multiple-choice questions on DC motor rotation direction changes through magnetic field alterations and relationships between atomic energy transitions and spectral line types.
Multiple-choice questions on energy conversion in electrical machines and relationships between electron energy transitions and emission or absorption spectral line characteristics.
Multiple-choice page covering the relationship between red-shift and recession velocity of stars, and the combined electric field direction from two charged spheres at a point.
Carry on through the Grade 12 curriculum.
Organic Molecules past paper questionsDescriptions last updated 6 August 2026.