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

Author Question: According to modern science, approximately how old is the Sun? A) 25 million years B) 10,000 ... (Read 33 times)

drink

  • Hero Member
  • *****
  • Posts: 554
on: Jul 27, 2018
According to modern science, approximately how old is the Sun?
 
  A) 25 million years B) 10,000 years C) 400 million years D) 4.5 billion years

Question 2

Explain why an absorption line spectrum is not filled back in (to make the original continuous spectrum) by the photons that are emitted as the excited electrons decay back down to their original energy levels.
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

milbourne11

  • Sr. Member
  • ****
  • Posts: 322
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

The photons emitted by the decays are emitted in random directions. Hence only a fraction of them are sent back in their original direction towards us.


drink

  • Hero Member
  • *****
  • Posts: 554
Reply #2 on: Jul 27, 2018
Thank you!


milbourne11

  • Sr. Member
  • ****
  • Posts: 322
Reply #3 on: Jul 27, 2018
Always glad to help...


« previous next »
 

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Did you know?

Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

The Food and Drug Administration has approved Risperdal, an adult antipsychotic drug, for the symptomatic treatment of irritability in children and adolescents with autism. The approval is the first for the use of a drug to treat behaviors associated with autism in children. These behaviors are included under the general heading of irritability and include aggression, deliberate self-injury, and temper tantrums.

The work of Charles Darwin forms the foundation for modern evolutionary theory. The work of Charles Darwin forms the foundation for modern evolutionary theory.
Poverty rates have declined in the last 50 years, and the biggest decline has been for people 65 and ... Poverty rates have declined in the last 50 years, and the biggest decline has been for people 65 and ...
Modern fishing fleets deplete marine life Modern fishing fleets deplete marine life
Foundations of Earth Science, 7th Edition Foundations of Earth Science, 7th Edition
Earth 600 Million Years Ago Earth 600 Million Years Ago
The migration of modern humans out of Africa The migration of modern humans out of Africa
Video: Inflammation

For a complete list of videos, visit our video library