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Author Question: The atomic number and mass number for calcium-39 are 20 and 39, respectively. How many neutrons are ... (Read 155 times)

ec501234

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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


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josephsuarez

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Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

A


ec501234

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Reply 2 on: Jul 29, 2018
Wow, this really help

frankwu0507

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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