« previous next »

Author Question: Ordinary matter makes up approximately ____percent of the critical density of the Universe. a. ... (Read 54 times)

TVarnum

  • Hero Member
  • *****
  • Posts: 548
on: Jul 27, 2018
Ordinary matter makes up approximately ____percent of the critical density of the Universe.
 
  a. 0.1
  b. 1
 c. 4.5
  d. 10
 e. 50

Question 2

How many nuclear reactions occur in a proton-proton chain?
 
  a. two
 b. three
  c. one
 d. four
 e. five


al

  • Sr. Member
  • ****
  • Posts: 344
Reply #1 on: Jul 27, 2018
Answer to Question 1

c

Answer to Question 2

b


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

Did you know?

The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

Did you know?

Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Did you know?

The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

The grey side-gilled sea slug Pleurobranchaea maculata. The discovery of tetrodotoxin in this slug i The grey side-gilled sea slug Pleurobranchaea maculata. The discovery of tetrodotoxin in this slug i
Critical Thinking Skills chart Critical Thinking Skills chart
Concepts for a critical thinker Concepts for a critical thinker
Population Density versus Economic Growth Population Density versus Economic Growth
Critical-Thinking Tip Critical-Thinking Tip
Physics- Density, Pressure and Pascal's Principle Physics- Density, Pressure and Pascal's Principle
Video: Mechanisms of capillary exchange (transcytosis & bulk flow)

For a complete list of videos, visit our video library