What Was the Temperature of the Universe When a Typical $\lambda$

question 18

Essay

What was the temperature of the universe when a typical CMB photon was no longer able to spontaneously create a proton and antiproton pair? Note that a photon has an energy equal to E = hc/ $\lambda$ , the CBR at any point in time has a blackbody spectrum that peaks at $\lambda$ _peak = (2,900 $\mu$ m K)/T, and the mass of a single proton is 1.7 *10^-27 kg.

Acknowledge the biological basis of social connections and pain, particularly in relation to the anterior cingulate cortex.

Recognize the impact of social support mechanisms like chain migration on alleviating loneliness and depression among refugees.

Understand the role of self-disclosure and social interaction in coping with life challenges and enhancing personal relationships.

Understand the reasons behind American businessmen's push for annexation of Hawaii.

---

Definitions:

Small Stock Dividend

A dividend paid in the form of additional shares of the issuing corporation, typically representing less than a 25% increase of the outstanding shares.

Retained Earnings

The portion of net income that is retained by the corporation rather than distributed to its owners as dividends.

Additional Paid-In Capital

Additional paid-in capital is the amount of money that shareholders have paid for shares above the stated par value during issuance, representing excess funds contributed by shareholders.

Shares Outstanding

The total number of a company's shares of stock that are owned by shareholders, including both public investors and corporate insiders.