BRAINCAKEThe Discovery of Helium
Helium was discovered from the light spectrum of the Sun.
A pattern of spectral lines that had never been observed before were due to an unknown element in the Sun.
Helium is produced in the Sun from the nuclear fusion of hydrogen.
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Key terms in this lesson
- Alpha particle
- A helium nucleus, consisting of two protons and two neutrons, emitted from an unstable nucleus in alpha decay.
- Resistance
- The ratio of the potential difference across a component to the current flowing through it, measured in ohms.
More in The Photoelectric Effect
- De-excitation
- Fluorescence
- Fluorescent Tube
- Line Spectra
- Excitation of Hydrogen Atoms
- The Dual Nature of Light
- De Broglie's Hypothesis
- Evidence for de Broglie's Hypothesis
All 19 lessons in The Photoelectric Effect · All AQA AS-level Physics topics