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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.
Based on your prior knowledge of the relationship between aggression and viewing of violent television programs, which scatter diagram do you think most accurately depicts this relationship? Explain.
Why do you think gender equality in the working environment is important?
What substances are produced by photosynthesis? By cellular respiration?
The events of September 11, 2001, contributed to an increase in hate crimes against Muslims around the world and especially in the United States. In the first year after the September 11 attacks, anti-Islamic hate crimes in the United States rose mor..
1.what are the differences between probability and coincidence? can the probability be more than 1 or less than 0?
Locate information regarding human decision-making process . It also has to include how humans make logical and risky decisions. Also methods that could be used by individuals to decrease risky decision making in favor of logical decision maki..
1. Argue for or against the principle that a just society must provide equality of opportunity for those with the interest and talent.
despite the best efforts of psychologists psychiatrists and medical researchers psychological disorders appear to be as
Create an example of an imaginary quantitative nursing study you would design that would use regression analysis.
What are the risk factors in the country that cause the population to most likely die from these causes?
1 what did the astronomer edwin hubble discover about galaxies in the 1920s?2 what formula is used to calculate the
Physical and Psychological effects of job stress
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