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Half Life
Quiz 2
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Q.1
If 1/4 of a sample of Hydrogen-2 remains unchanged after 4.minutes. How long is the half-life of Hydrogen-2?
4.60 min
2.30 min
1.15 min
0.58 min
Q.2
Which of the following samples would have the greatest amount remaining afterdays?
5g of Au-198
10g of I-131
5g of P-32
10g of Rn-222
Q.3
Which sample would have the least amount remaining after 1 minute?
100g of Francium-220
100g of Potassium-37
100g of Neon-19
100g of Nitrogen-16
Q.4
Which sample would have the greatest amount remaining after 1 minute?
100g of Francium-220
100g of Potassium-37
100g of Neon-19
100g of Nitrogen-16
Q.5
How much time must pass for Hydrogen-3 to undergo 3 half-lives?
12.31 years
36.93 years
4.10 years
3.00 years
Q.6
What is the half-life of Radon-222?
1599 years
27.4 seconds
3.823 days
12.36 hours
Q.7
The half-life of a radioactive isotope is not effected by which of the following?
Temperature
Pressure
Concentration
None of these will effect the rate of a nuclear reaction
Q.8
As a sample of Neon-undergoes radioactive decay, its half-life will
decrease
increase
remain the same
start over
Q.9
After the third half-life, how much of a radioactive sample is left?
1/2
1/3
1/16
1/8
Q.10
Which isotope has a half-life ofyears?
Carbon-12
Cobalt-60
Carbon-14
Cesium-137
Q.11
What is the most penetrating radiation?
gamma
alpha
beta
positron
Q.12
Which type of radiation can be stopped by a sheet of paper or clothing?
Alpha
Beta
Gamma
Q.13
What is emitted during Gamma Radiation?
Particles.
Protons
Beta Rays.
Gamma Rays.
Q.14
Like chemical reaction rates, nuclear decay rates vary with the conditions of reaction.
True
False
Q.15
Radiation can cause what?
Superpowers
Cancer
Headaches
The flu
Q.16
Which type of radiation penetrates paper and skin, or a thin sheet of metal, but can be stopped by a sheet of lead, or thick concrete?
Alpha
Beta
Gamma
Q.17
If one haskg of Polonium and it undergoes two half-lives, how much do you have left?
12 kg
3 kg
6 kg
Q.18
The half life of an element isminutes. What % of the element remains after an hour?
0%
12.5%
20%
25%
Q.19
Uranium has two isotopes but only one of them is radioactive. Which one?
U-235
U-238
Q.20
The radioactive isotope Nickel-has a half life ofyears. How much of agram sample remains afteryears?
1 gram
1.25 grams
0.50 grams
0.075 grams
0 h : 0 m : 1 s
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