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Answer True or False for each question. For the three questions indicated also provide a full...

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Physics

Answer True or False for each question. For the threequestions indicated also provide a full explanation; this is likelyto take at least two sentences.

1) Production of particle-antiparticle pairs ended because gammaray energy decreased as the U expanded.

2) At the beginning, all the energy in the universe was in theform of neutrinos.

3) By t = 15 min, the Universe had cooled enough thatnucleosynthesis ended.

4) In the Bottom-up scenario with Cold Dark Matter, smallstructures like dwarf galaxies form first.

5) It will be possible to measure all properties of a particlewith perfect accuracy if our technology increases.

6) By t = 1 sec, the U contained about 25 % He nuclei and therest H nuclei . Explain.

7) In quantum physics, Heisenberg's uncertainty principle saysthat matter and antimatter can appear spontaneously in empty space.Explain.

8) Our U contains mass because for every 109 matterparticles it created it also created 109+ 1 antimatterparticles. Explain.

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