Considering the reactions in primordial nucleosynthesis only, what would be the impact on the universe today if the neutron lifetime were much smaller than 886s (the actual value of the neutron lifetime)? Select one: O a. Annihilations mean that the universe is left composed entirely of photons and neutrinos O b. There would be no difference to the actual universe c. Only hydrogen atoms would be present today O d. There would be very small amounts of He in the universe today

Considering the reactions in primordial nucleosynthesis only, what would be the impact on the universe today if the neutron lifetime were much smaller than 886s (the actual value of the neutron lifetime)? Select one: O a. Annihilations mean that the universe is left composed entirely of photons and neutrinos O b. There would be no difference to the actual universe c. Only hydrogen atoms would be present today O d. There would be very small amounts of He in the universe today

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.

Question

Considering the reactions in primordial
nucleosynthesis only, what would be the
impact on the universe today if the neutron
lifetime were much smaller than 886s (the
actual value of the neutron lifetime)?
Select one:
O a. Annihilations mean that the universe
is left composed entirely of photons
and neutrinos
O b. There would be no difference to the
actual universe
O c. Only hydrogen atoms would be
present today
O d. There would be very small amounts
of 4He in the universe today

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