Grade 11 Physics
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
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
3. When an unstable nuclide emits a gamma rays, there is no change in its…
a) Atomic number
b) Atomic mass number
c) Nucleon number
d) All of the above
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
5. How much of a radioactive substance remains after three half-lives?
a) One third
b) One half
c) One quarter
d) One eight
e) One sixth
6. A gamma ray is essentially a very high energy photon.
a) True
b) False
7. All radiation emissions, alpha, beta, and gamma, transmutate an element.
a) True
b) False
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
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
10. A beta decay always involves the release of an electron or a positron.
a) True
b) false
1. b) β Particle
2. a) Alpha emission
3. d) All of the above
4. a) 4.687 mg
5. c) One quarter
6. a) True
7. b) False
8. b) A helium atom
9. c) 8
10. a) True