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

Author Question: The atomic number and mass number for calcium-39 are 20 and 39, respectively. How many neutrons are ... (Read 169 times)

ec501234

  • Hero Member
  • *****
  • Posts: 573
on: Jul 29, 2018
The atomic number and mass number for calcium-39 are 20 and 39, respectively. How many neutrons are in one atom?
 
  A) 1
  B) 19
  C) 20
  D) 39
  E) 59

Question 2

A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0. What is the angle of refraction?
 
  A) 20.9
  B) 47.5
  C) 51.8
  D) 30.0
  E) 14.9


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

josephsuarez

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

A


ec501234

  • Member
  • Posts: 573
Reply 2 on: Jul 29, 2018
Wow, this really help

aruss1303

  • Member
  • Posts: 314
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Conscientiousness is negatively correlated with a number of health-related behaviors. The higher the ... Conscientiousness is negatively correlated with a number of health-related behaviors. The higher the ...
Spoon a few chunks of tofu onto your salad bar lunch for extra calcium Spoon a few chunks of tofu onto your salad bar lunch for extra calcium
What mass, in grams, of a 5.00% by mass sugar water solution is needed to supply What mass, in grams, of a 5.00% by mass sugar water solution is needed to supply
physics question number 5 - moving conductors physics question number 5 - moving conductors
How mitosis maintains the chromosome number. How mitosis maintains the chromosome number.
Separation of variable number tandem repeat (VNTR) alleles after PCR amplification Separation of variable number tandem repeat (VNTR) alleles after PCR amplification
Video: Darwin's Observation (Fossils, Galapagos Islands & Africa ) and Natural Selection (Adaptive Traits)

For a complete list of videos, visit our video library