CAIE IGCSE Physics Nuclear Fusion in Stable Stars

Practise identifying nuclear fusion as the energy source of stable stars and state that hydrogen nuclei join to form helium while energy is released.

Exam points

identify nuclear fusion, not fission or chemical burning, as the process powering stable stars
state that hydrogen nuclei join to form helium nuclei while releasing energy in the stellar core
link the released energy to electromagnetic radiation transferred from the star's surface into space

[Maximum number: 2]

Fig. 3.1 shows solar cells that use radiation from the Sun to generate electrical power.

Fig. 3.1

Describe what happens in this process.

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