In 2021, a private laboratory announced that they had achieved sustained deuterium-deuterium nuclear fusion inside a desktop acoustic cavitation chamber at a temperature of only 25 ∘C25\text{ }^{\circ}\text{C}25 ∘C.
Explain why physical scientists expressed deep skepticism regarding this announcement prior to any independent validation.
94 exam-style questions on Edexcel GCSE Physics 6.5 Uses and dangers of radioactivity, covering 6.5.1 Uses of radioactivity, 6.5.2 Dangers of ionising radiation and precautions, 6.5.3 Half-life and radiation dangers, 6.5.4 Safety precautions for radiation exposure, and 6.5.5 Contamination and irradiation. Each one has a worked solution and a mark scheme showing where the marks go.