Author Question: If you cover the penumbra with a black marker, the perception of the border _____. A) remains ... (Read 26 times)

plus1

  • Hero Member
  • *****
  • Posts: 676
If you cover the penumbra with a black marker, the perception of the border _____.
 
  A) remains constant
  B) changes from an illumination edge to a reflectance edge
  C) changes from a reflectance edge to an illumination edge
  D) can be predicted from the ratio principle

Question 2

When coming up with a research idea, one should always
 
  a. be aware of existing research.
  b. rely on one's intuition.
  c. be certain that the idea addresses real world problems.
  d. focus primarily on conflicting findings.



anoriega3

  • Sr. Member
  • ****
  • Posts: 323
Answer to Question 1

B

Answer to Question 2

a



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Did you know?

Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

Did you know?

Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

For a complete list of videos, visit our video library