This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why is hydrogen less obvious in B stars than in A class? What will be an ideal ... (Read 21 times)

vinney12

  • Hero Member
  • *****
  • Posts: 586
on: Jul 27, 2018
Why is hydrogen less obvious in B stars than in A class?
 
  What will be an ideal response?

Question 2

If the density of the universe is greater than critical, then
 
  A) the universe will end up as nothing but black holes.
  B) the universe will continue expanding forever.
  C) there is more matter than energy.
  D) the universe is closed, gravity wins, and will shrink to the Big Crunch.
  E) the universe is flat, and Euclid is right.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

coreycathey

  • Sr. Member
  • ****
  • Posts: 333
Reply #1 on: Jul 27, 2018
Answer to Question 1

Above 10,000K, the hydrogen atoms are mostly ionized, and not able to absorb photons any more.

Answer to Question 2

D


vinney12

  • Member
  • Posts: 586
Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

lcapri7

  • Member
  • Posts: 350
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

The Pleiades, an open cluster of stars in the constellation of Taurus. The Pleiades, an open cluster of stars in the constellation of Taurus.
An example of a Hertzsprung–Russell diagram for a set of stars that includes the Sun An example of a Hertzsprung–Russell diagram for a set of stars that includes the Sun
Label used to indicate a class IV controlled substance. Label used to indicate a class IV controlled substance.
The ethanol molecule showing two carbon atoms, six hydrogen atoms, and one oxygen atom. The ethanol molecule showing two carbon atoms, six hydrogen atoms, and one oxygen atom.
Hydrogen bond Hydrogen bond
How many hydrogen ions (H+) are present and on what side of the chemical equation? How many hydrogen ions (H+) are present and on what side of the chemical equation?
Video: Secondary and tertiary levels of protein structure Animation

For a complete list of videos, visit our video library