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

Author Question: Which of the following is thought to be a black hole? a. Gleise 229B b. Sirius B c. Orion Nebula ... (Read 12 times)

ghost!

  • Hero Member
  • *****
  • Posts: 560
on: Jul 28, 2018
Which of the following is thought to be a black hole?
 a. Gleise 229B
  b. Sirius B
  c. Orion Nebula
  d. Cygnus X-1

Question 2

When a hydrogen atom's electron goes from an energy state of n = 1 to n = 3,
 a. the radius of the electron's orbit is unchanged.
  b. the radius of the electron's orbit is increased.
  c. the radius of the electron's orbit is decreased.
  d. the radius of the electron's orbit is infinite.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

lcapri7

  • Sr. Member
  • ****
  • Posts: 350
Reply #1 on: Jul 28, 2018
Answer to Question 1

d

Answer to Question 2

b


ghost!

  • Member
  • Posts: 560
Reply 2 on: Jul 28, 2018
:D TYSM

Dinolord

  • Member
  • Posts: 313
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

Did you know?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

Did you know?

Cyanide works by making the human body unable to use oxygen.

Austrian Black and Tan Hound Austrian Black and Tan Hound
Black Hole Wind Black Hole Wind
black widow spider black widow spider
black swallower black swallower
Supermassive Black Hole Supermassive Black Hole
Notice the small motor gear on the left drives a larger plastic gear (black), which then drives ... Notice the small motor gear on the left drives a larger plastic gear (black), which then drives ...
Video: Polysaccharides

For a complete list of videos, visit our video library