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 13 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
Excellent

ghepp

  • Member
  • Posts: 361
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

Did you know?

Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

Did you know?

Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

Did you know?

It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

Black and Tan Coonhound Black and Tan Coonhound
The Crab Nebula and Pulsar The Crab Nebula and Pulsar
Supermassive Black Hole Supermassive Black Hole
Accretion Disk Around a Supermassive Black Hole Accretion Disk Around a Supermassive Black Hole
Frederic Edwin Church conveyed the romantic sensibility in Twilight in the Wilderness (1860). The cl Frederic Edwin Church conveyed the romantic sensibility in Twilight in the Wilderness (1860). The cl
Black female Vs. Gray male Black female Vs. Gray male
Video: Genetic distance between human groups

For a complete list of videos, visit our video library