Answer all questions.

Question

Answer all questions.

Question 1
A decay that involves a high-speed electron is a(n) ____________________ decay
a) α particle
b) β particle
c) γ ray
d) all of the above

Question 2
What type of radioactivity doesn't change the atomic number of a nuclide?
a) alpha emission
b) beta emission
c) gamma emission
d) none of the above

Question 3
When an unstable nuclide emits a gamma ray, there is no change in its . . .
a) atomic number
b) atomic mass number
c) nucleon number
d) all of the above

Question 4
A 100-mg sample of carbon-11 has a half-life of 20.385 min. How much carbon-11 will remain after 90 min?
a) 4.687 mg
b) 4.415 mg
c) 2.207 mg
d) 2.101 mg
e) none

Question 5
How much of a radioactive substance remains after three half-lives?
a) one third
b) one half
c) one quarter
d) one eighth
e) one sixth

Question 6
A gamma ray is essentially a very high energy photon. True or False?

Question 7
All radiation emissions, alpha, beta, and gamma, transmutate an element. True or False?

Question 8
An alpha particle is the nucleus of . . .
a) an oxygen atom
b) a helium atom
c) a carbon atom
d) a hydrogen atom
e) a uranium atom

Question 9
A nuclide has an atomic mass number of 14 and an atomic number of 6. How many neutrons does the nuclide have?
a) 20
b) 84
c) 8
d) 6
e) 14

Question 10
A beta decay always involves the release of an electron or a positron. True or False?

Answer 1

Question 1: b) β particle

Question 2: c) gamma emission
Question 3: a) atomic number
Question 4: c) 2.207 mg
Question 5: c) one quarter
Question 6: True
Question 7: False
Question 8: b) a helium atom
Question 9: c) 8
Question 10: True

Answer 2

what is the correct answer for questions 4 & 5?

Answer 3

I apologize for the errors in my previous response. Here are the corrected answers:

Question 4: d) 2.101 mg
Question 5: d) one eighth