The photon energy exactly equals the energy difference between levels, given by h f equals E upper minus E lower, making emission and absorption spectra perfectly predictable. Each element has a unique set of allowed energy levels, creating a reliable spectral fingerprint that never changes. This is the real knowscape from knowhere, not a picture of one. Drag it. Watch what actually changes.
Every model here is a patch on the one before it: Bohr bolts quantised orbits onto a classical atom to explain hydrogen's spectrum, de Broglie says the electron is a wave, and Schrödinger drops orbits entirely for a cloud of probability. The exam isn't asking which is right — it's asking what each fixed and what it still couldn't.
From far off the electron looks like one neat dot circling, just as Bohr drew it.
Zoom in and that dot smears — you can't pin its exact spot anymore.
All you see is a cloud showing where it's most likely to be.
knowhere maps every concept to what it rests on and what rests on it — 2 underneath this one, 0 built on top. Each one says why, in a sentence, not as an arrow on a diagram.
Each one is its own knowscape in the app — built for how a particular student takes things in, not one explanation handed to everybody.
Every HSC and VCE concept in knowhere is built like this one — mapped to your curriculum, never capped by it. Free for a week. No card tricks, no lecture.
Free for a week, then $49 once — the 2026 exam pass ends itself after the last exam. 0 days of the pass left.
Free for a week, then a plan you can stop any time.
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