1. The loss of an alpha particle causes: a. no change in the atomic number. b. t
ID: 1014501 • Letter: 1
Question
1. The loss of an alpha particle causes:
a. no change in the atomic number.
b. the atomic number to decrease by 1.
c. the atomic number to decrease by 2.
d. the atomic number to decrease by 4.
2. The loss of an alpha particle causes:
a. no change in the mass number.
b. the mass number to decrease by 1.
c. the mass number to decrease by 2.
d. the mass number to decrease by 4.
3. The loss of a beta particle causes:
a. no change in the atomic number.
b. the atomic number to decrease by 1.
c. the atomic number to increase by 1.
d. the atomic number to decrease by 2.
4. The loss of a beta particle causes:
a. no change in the mass number.
b. the mass number to decrease by 1.
c. the mass number to increase by 1.
d. the mass number to decrease by 2.
5. As long as a green plant is alive, its carbon-14/carbon-12 ratio:
a. increases. b. is constant.
c. decreases. d. is equal to 1.
6. Carbon-14 has a half-life of 5730 years. It could not be used to date objects made of:
a. wood. b. animal skin.
c. wool. d. metal.
7. Phosphorus-32 has a t½ of 14 days. How much of a 3.2 g sample is left after 98 days?
a. 0.100 g b. 50 mg
c. 0.050 g d. 25 mg
8. A measure of the biological damage caused by the various kinds of radiation.
a. Curie b. REM
c. RAD d. RAM
Explanation / Answer
1. c. the atomic number to decrease by 2.
alpha particle is double charged helium neuclide 2He4
2. d. the mass number to decrease by 4.
alpha particle is double charged helium neuclide 2He4 . it's mass is four
3. c. the atomic number to increase by 1.
beta particle is -1e0
4. a. no change in the mass number.
beta particle is -1e0 . it has no mass
5. d. is equal to 1.
carbon-14and carbon-12 are same
6. a. wood.
7. K = 0.693/t1/2
K = 0.693/14 = 0.0495day-1
K = 2.303/t log[A0]/[A]
0.0495 = 2.303/98 log 3.2/[A]
log 3.2/[A] = 0.0495*98/2.303
log 3.2/[A] = 2.1
3.2/[A] = 102.1
3.2/[A] = 125.89
[A] = 3.2/125.89 =0.0254g
d. 25mg >>> answer
8. a. Curie
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