9TH GRADE · NUCLEAR PHYSICS
Ionizing radiation and thermonuclear fusion
Biological action, protection, synthesis, particles and antiparticles.
The entire theory of the lesson is collected here; you can read it without an account. In interactive mode, the same theory appears as cards, followed by questions. with checking the answer and task, and progress is saved.
Basic Concepts
Biological effects of radiation
Ionizing radiation damages molecules and cells, and the risk depends on the dose, type and conditions of exposure.
The protection combines reduced time, increased distance and a suitable shield without replacing dose control.
Thermonuclear reaction
Light nuclei combine to form a heavier nucleus, releasing energy at very high temperatures.
Fusion powers the stars; on Earth, a controlled reaction requires confinement of hot plasma.
Elementary particles and antiparticles
Elementary particles have no observable internal structure at the level under consideration, and antiparticles have opposite charges.
When a particle meets an antiparticle, annihilation is possible with the transformation of rest energy into other particles and radiation.
Physical quantities
Irradiation time
Duration of exposure to ionizing radiation.
Unit: second ·
Tasks on the topic
Statements, answer options and the walkthrough.