Modern Physics & Estimation

Topic overview

Scope-restricted training: photoelectric effect, nuclear physics and order-of-magnitude estimation; unverified relativistic prerequisite methods do not enter the new problem sets.

Key concepts

Round 1/2 cannot be mixed. This site only provides training with limited scope; unverified university-level methods do not enter new problem sets, and no claim is made to be an official complete paper.

Key points

◆Follow the prerequisite knowledge requirements given by the examination body; new concepts may only be used when the question provides sufficient guidance.
◆The examples on this site are training with a limited scope and do not represent full syllabus coverage or official difficulty.

Worked examples

Try each example yourself before checking the explanation.

1Basic examples within scope

Light of photon energy $3.1$ eV strikes a metal of work function $2.1$ eV. Find the maximum kinetic energy of the emitted photoelectrons.

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