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So I've been looking into particle-antiparticle pair production from a gamma ray and don't understand one thing.
Let's say I have a 1,1 MeV photon and it hits a nucleus - electron-positron pair with some momentum will be created and the nucleus will probably get some momentum as well because of the impact.
But why does the photon need the nucleus at all? Why can't it just fly through space and suddenly, with some probability, change into a electron-positron pair with momentum? I see that the momentum of the system wouldn't be conserved but I don't really understand how the nucleus helps it.
Are CDHPs more geared toward the healthier and younger population?
What are two essential differences between human brains and the central processing unit of a computer.
How would omitting one of these forensic procedures negatively affect either the investigation or prosecution process?
Westermarck ends his article wit this: The presumed objectivity of moral judgments thus being an illusion, there can be no moral truth in the sense in which this term is generally understood. Moral concepts based upon emotions.Do you think much or al..
How do the health-related Millennium Development Goals address health disparities?
What is the direction of plate movement relative to one another in a divergent plate boundary?
Select a contemporary issue that is of interest to you. Create an attitude survey using your selected issue.
Using a multidisciplinary approach, list other health care professionals the client should be referred to with an eating disorder.
Describe some cognitive tasks (not already mentioned in the textbook) in which one might utilize mental imagery.
Question 1. Name a serum compound produced by genetically modified bacteria to treatQuestion 2. How many chromosomes are present in a bacterial cell?Question 3. Name four sites in the human body where many bacteria are found.
The development of heart disease
1.Explain the politics of the US drug war with regard to 1) political realignments, 2) civil liberties, and 3) civil rights. Your response should discuss current strategies employed to combat the drug war and relevant constitutional provisions..
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