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Unit 4: Wave Models and Quantum Physics
Quick questions on Atomic models and energy levels: WACE Year 12 Physics Unit 4
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are bohr's quantised levels?Show answer
Bohr postulated that electrons can occupy only certain discrete, stable energy levels (orbits) without radiating, and that radiation occurs only when an electron jumps between levels. Each level has a fixed energy, with the lowest (ground state) most tightly bound and higher levels closer together near the top. The energies are negative, measured relative to a free electron at zero, because the electron is bound to the atom.
What is getting the energy difference right?Show answer
Subtract the lower (more negative) energy from the higher one and take the magnitude; the photon energy is always positive. Convert electronvolts to joules before using unless you are working in eV throughout. Emission is a downward jump, absorption an upward jump.
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