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

Author Question: Current searches for extraterrestrial intelligence use radio telescopes at wavelengths a. which ... (Read 87 times)

ericka1

  • Hero Member
  • *****
  • Posts: 544
Current searches for extraterrestrial intelligence use radio telescopes at wavelengths
 
  a. which must be shorter than the local wavelengths emitted by Earth's atmosphere.
  b. which must be longer than the radio wavelength noise' naturally emitted by our galaxy.
  c. which must be longer than the local wavelengths emitted by Earth's atmosphere and which must be shorter than the radio wavelength noise' naturally emitted by our galaxy.
  d. Wrong Visual light wavelengths are used because radio waves are blocked by dust between the stars.

Question 2

The number of technological civilizations in our galaxy is limited by
 
  a. the number of stars in our galaxy.
  b. the fraction of stars with planets.
  c. the number of planets per star in habitable zones longer than a few billion years.
  d. the fraction of suitable planets where technical life forms evolve.
  e. the number of stars in our galaxy, the fraction of stars with planets, the number of planets per star in habitable zones longer than a few billion years, and the fraction of suitable planets where technical life forms evolve.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kaillie

  • Sr. Member
  • ****
  • Posts: 326
Answer to Question 1

c

Answer to Question 2

e




ericka1

  • Member
  • Posts: 544
Reply 2 on: Jul 27, 2018
Gracias!


ryansturges

  • Member
  • Posts: 338
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

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 documented use of surgical anesthesia in the United States was in Connecticut in 1844.

Did you know?

In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.

Did you know?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

For a complete list of videos, visit our video library