Author Question: About 1 s after the Big Bang, the temperature of the universe was about 1013 K. What energy (in eV) ... (Read 97 times)

magmichele12 · **on:** Jul 29, 2018

About 1 s after the Big Bang, the temperature of the universe was about 1013 K. What energy (in eV) does this correspond to?

A)

1 neV
B)

1 keV
C)

1 MeV
D)

1 GeV
E)

1 TeV

Question 2

Describe the operation of an automobile internal combustion engine in terms of the Otto cycle.

What will be an ideal response?

nothere · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

D

Answer to Question 2

The gas (gasoline-air mixture) enters the cylinder and is compressed adiabatically (compression stroke). After the ignition occurs (spark plug), burning of the gas adds heat to the system at constant volume. The temperature and pressure rise, and then in the power stroke, the gas expands adiabatically. In the exhaust stroke, heat is ejected to the environment (in a real engine, the gas leaves the engine and is replaced by a new mixture of air and fuel).