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

Author Question: Which of the following is true of wavelengths of signals sent into space? A) Wavelengths longer ... (Read 67 times)

cherise1989

  • Hero Member
  • *****
  • Posts: 555
on: Jul 27, 2018
Which of the following is true of wavelengths of signals sent into space?
 
  A) Wavelengths longer than 100 cm are absorbed in Earth's atmosphere.
  B) The interval between the 21-cm spectral line of neutral hydrogen and the 18-cm line of OH has very high background interference.
  C) Wavelengths longer than 100 cm get lost in the background noise of the Milky Way Galaxy.
  D) The interval between the 21-cm spectral line of neutral hydrogen and the 18-cm line of OH is narrow and can be monitored easily.

Question 2

Which of the following is true of natural selection?
 
  A) It is a random occurrence.
  B) It does not occur in most species of organisms.
  C) It is directed by changes in the environment.
  D) It does not lead to evolution of a species.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Alyson.hiatt@yahoo.com

  • Sr. Member
  • ****
  • Posts: 354
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

C


cherise1989

  • Member
  • Posts: 555
Reply 2 on: Jul 27, 2018
Excellent

epscape

  • Member
  • Posts: 335
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Did you know?

Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Brain signals that control hunger. Brain signals that control hunger.
Space Space
The Parallax of a Nearby Object in Space The Parallax of a Nearby Object in Space
The Hubble Space Telescope The Hubble Space Telescope
Action of Satiety Signals on Hypothalamic Neurons Involved in Control of Hunger and Satiety Action of Satiety Signals on Hypothalamic Neurons Involved in Control of Hunger and Satiety
True Dover Sole True Dover Sole
Video: Methods of carbon dioxide transport - carbaminohemoglobin and bicarbonate ions

For a complete list of videos, visit our video library