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

Author Question: Sending signals at optical wavelengths might be a viable alternative to radio wavelengths A) only ... (Read 207 times)

jazziefee

  • Hero Member
  • *****
  • Posts: 505
Sending signals at optical wavelengths might be a viable alternative to radio wavelengths
 
  A) only between civilizations around solar-type stars whose eyes have evolved to see such radiation
  B) over relatively short distances where absorption by interstellar matter would not be a problem
  C) as long as the light transmitted is a different color than the light given off by the parent star
  D) over all distances as long as the intensity of the signal is strong enough

Question 2

The images formed by concave lenses
 
  A) are always virtual.
  B) could be real or virtual, but always real when the object is placed at the focal point.
  C) could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length.
  D) are always real.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

jonathanballen97

  • Sr. Member
  • ****
  • Posts: 347
Answer to Question 1

B

Answer to Question 2

A





 

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?

There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Did you know?

Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

Did you know?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

For a complete list of videos, visit our video library