A three-point frequency scan makes the toy photon-energy proportionality visible. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Two hertz gives four joules in the toy ledger
With toy constant 2 joules per hertz, frequency 2 hertz gives per-photon energy 4 joules. A fixed packet of 2 photons carries 8 joules.
Eγ=2⋅2=4,2Eγ=8
Four hertz gives eight joules
Keeping the toy constant fixed, frequency 4 hertz gives energy 8 joules per photon and packet total 16 joules.
Eγ=2⋅4=8,2Eγ=16
Six hertz gives twelve joules
Frequency 6 hertz gives energy 12 joules per photon and total packet energy 24 joules. Three rows make frequency proportionality visible.