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Modern Physics
Quick questions on Energy levels and line spectra explained: H2 Physics Modern Physics
4short 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 discrete energy levels?Show answer
An electron in an atom can occupy only certain allowed energies, called energy levels, and not the values in between. The levels are usually drawn as horizontal lines on an energy-level diagram, with the lowest (most negative) being the ground state and higher levels being excited states. The energies are negative because the electron is bound to the atom, with zero taken when the electron is just free.
What is q1?Show answer
Explain what is meant by a discrete energy level in an atom. [2 marks]
What is q2?Show answer
An electron drops from a level at to one at . Find the energy of the emitted photon. [2 marks]
What is q3?Show answer
Explain why each element has a unique line spectrum. [2 marks]
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