Answered: Which particles are not present in the…

Which particles are not present in the universe at t=300s after the big bang ? select one : a. Electons b. photons c. neutrons d. Positrons

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter11: Particle Physics And Cosmology

Section: Chapter Questions

Problem 18CQ: Draw a Feynman diagram to represents annihilation of an electron and position into a photon.

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Concept explainers

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

Question

Which particles are not present in the universe at t=300s after the big bang ?

select one :

a. Electons

b. photons

c. neutrons

d. Positrons

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