If an atom of polonium (atomic number 84) undergoes a conversion to lead (atomic number 82) by the loss of a single particle,
the particle lost was a positron
the particle lost was an alpha particle
the particle lost was a gamma ray
the particle lost was a beta particle
the particle lost could have been an alpha particle or a beta particle
Carbon-12 and carbon-13 are stable isotopes of the element. Which of the following isotopes of carbon is likely to undergo positron emission?
carbon-11
carbon-12
carbon-13
carbon-14
carbon-15
In the equation shown here, the missing particle is:
The equation shows an example of beta particle decay
The equation shows an example of positron emission
The equation shows an example of alpha particle emission
The equation shows an example of electron capture
The equation shows an example of gamma ray emission
Bones found in the Lascaux Caves in France have a carbon-14 disintegration rate of 2.25 disintegrations per minute per gram of carbon. If the rate of decay rate of carbon-14 at the time of death is 13.6 counts per minute per gram of carbon, calculate the age of the remnants. The half-life of carbon-14 is 5730 years.
7.5 x 10^{4} years
1.91 x 10^{2} years
8.2 x 10^{6} years
1.5 x 10^{4} years
2.3 x 10^{3} years
After polonium-214 undergoes an alpha decay and two beta decays, the particle produced is:
lead-206
polonium-210
radon-222
bismuth-214
lead-214
Phosphorus-15 has a half-life of 14 days. What proportion of the original phosphorus-15 remains after 8 weeks?
1/2
1/4
1/8
1/16
1/32
The decay rate constant for a newly discovered element, tentatively named "Allanium", is 2.4 x 10^{-2} s^{-1}. What is the half-life of the new element.
29 s
0.017 s
0.035
1.2 years
7.2 s
The half-life of carbon-14 is 5730 years. If a sample of wood is found to have only 13.2% of its original carbon-14 remaining, how old is the piece of wood?
2.13 x 10^{4} years
4.35 x 10^{5} years
7.11 x 10^{4} years
1.67 x 10^{4} years
9.00 x 10^{-3} years
The number of radioactive nuclides in a sample decays from 9.34 x 10^{23} to 5.42 x 10^{23} in 28 minutes. What is the half-life of the nuclide?
35.7 minutes
23.1 minutes
30.1 minutes
2.45 x 10^{3} minutes
24.4 minutes^{-1}
One fission process of uranium-235 is:
What is the missing particle?
Electron capture would transform carbon-12 into what nuclide?
boron-13
boron-12
carbon-13
nitrogen-13
carbon-11
The nuclide radium-226 is the daughter nuclide resulting from the a decay of what parent nuclide?
radon-222
thorium-228
thorium-230
polonium-214
radium-225
Identify the missing particle in the following nuclear reaction:
^{239}_{92}U + ^{4}_{2}He → _____ + ^{1}_{0}n
^{241}_{94}Pu
^{243}_{94}Pu
^{243}_{92}U
^{241}_{92}U
Identify the missing particle in the following nuclear reaction:
^{27}_{13}Al + ^{4}_{2}He → ^{30}_{15}P + _____
^{1}_{0}n
^{1}_{1}H
^{61}_{30}Zn
^{7}_{4}Be
Identify the missing particle in the following nuclear reaction:
^{241}_{95}Am + ^{4}_{2}He → 2^{1}_{0}n + _____
^{243}_{97}Bk
^{236}_{97}Bk
^{243}_{93}Np
^{244}_{93}Np
Identify the missing particle in the following nuclear reaction:
^{214}_{84}Po + 2^{4}_{2}He + 2^{0}_{-1}e → _____
^{222}_{86}Rn
^{218}_{88}Ra
^{222}_{84}Po
^{218}_{86}Rn
Identify the missing particle in the following nuclear reaction:
^{27}_{13}Al + _____ → ^{24}_{11}Na + ^{4}_{2}He
^{1}_{0}n
^{1}_{0}H
^{0}_{-1}e
^{28}_{13}Al
Identify the missing coefficient in the following nuclear reaction: