Energy levels and photon emission (AQA A-Level Physics): Quizzes

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Energy levels and photon emission
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What produces a line spectrum?

Light from a fluorescent tube through a prism

What is a key feature of a line spectrum?

Contains discrete wavelengths only

What do line spectra provide evidence for?

Quantised energy levels in atoms

How is an absorption spectrum produced?

White light passed through a cooled gas

What do dark lines in an absorption spectrum represent?

Wavelengths absorbed by the gas atoms

What is the energy difference ΔE\Delta E between two energy levels E1E_1 and E2E_2?

ΔE=E1−E2\Delta E = E_1 - E_2

Which equation relates photon energy to energy level difference?

hf=E1−E2hf = E_1 - E_2

In E=hfE = hf, what does hh represent?

Planck's constant

An electron drops from −1.5-1.5 eV to −3.4-3.4 eV. What is ΔE\Delta E in eV?

1.91.9 eV

What happens when electrons transition between discrete energy levels?

They emit or absorb photons of specific energy

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