Practice question · Match the pairs
Match each quantity to what it controls.
- Photon frequency
- Beam intensity
- Work function
- Principal quantum number
- The energy of one photon
- The number of photons per second
- Which rung of the energy ladder
- The energy cost of escaping the metal
Hints
- Separate what each photon carries from how many arrive.
- The work function is a property of the metal, not of the light.
Show the answer
- Photon frequency → The energy of one photon
- Beam intensity → The number of photons per second
- Work function → The energy cost of escaping the metal
- Principal quantum number → Which rung of the energy ladder
Why
Frequency fixes energy per photon; intensity fixes photon count; the work function is the metal’s escape cost; labels the allowed energy level.
Practise Atomic Spectra and the Quantum Atom
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