This topic contains a solution. Click here to go to the answer

Author Question: Telescopes operating at this wavelength must be cooled to observe faint astronomical objects. A) ... (Read 62 times)

darbym82

  • Hero Member
  • *****
  • Posts: 570
Telescopes operating at this wavelength must be cooled to observe faint astronomical objects.
 
  A) radio
  B) extreme infrared
  C) visible
  D) X-ray
  E) gamma-ray

Question 2

Ionization of hydrogen in H II regions is most visible at:
 
  A) 12,367 nm, the Paschen alpha line.
  B) 656.3 nm, Balmer alpha line for 3-2 electron transition.
  C) 21 cm in the radio region for the spin-flip of its electron.
  D) 121.3 nm, the Lyman alpha ultraviolet line for 2-1 electron transition.
  E) 473.2 nm, the blue-green emission line for 4-2 electron transition.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

adammoses97

  • Sr. Member
  • ****
  • Posts: 337
Answer to Question 1

B

Answer to Question 2

B




darbym82

  • Member
  • Posts: 570
Reply 2 on: Jul 27, 2018
Wow, this really help


pangili4

  • Member
  • Posts: 346
Reply 3 on: Yesterday
Excellent

 

Did you know?

In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

Did you know?

In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.

Did you know?

In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

For a complete list of videos, visit our video library