Transcript Up11_educue_ch43

Q43.1
A nucleus of neon-20 has 10 protons and 10 neutrons.
A nucleus of terbium-160 has 65 protons and 95 neutrons.
Compared to the radius of a neon-20 nucleus, the radius of a
terbium-160 nucleus is
1. 9.5 times larger
2. 8 times larger
3. 6.5 times larger
4. 4 times larger
5. 2 times larger
A43.1
A nucleus of neon-20 has 10 protons and 10 neutrons.
A nucleus of terbium-160 has 65 protons and 95 neutrons.
Compared to the radius of a neon-20 nucleus, the radius of a
terbium-160 nucleus is
1. 9.5 times larger
2. 8 times larger
3. 6.5 times larger
4. 4 times larger
5. 2 times larger
Q43.2
Why do stable nuclei with many nucleons (those with a large
value of A) have more neutrons than protons?
1. an individual nucleon interacts via the nuclear force
with only a few of its neighboring nucleons
2. the electric force between protons acts over long
distances
3. the nuclear force favors pairing of both neutrons and
protons
4. both 1. and 2.
5. all of 1., 2., and 3.
A43.2
Why do stable nuclei with many nucleons (those with a large
value of A) have more neutrons than protons?
1. an individual nucleon interacts via the nuclear force
with only a few of its neighboring nucleons
2. the electric force between protons acts over long
distances
3. the nuclear force favors pairing of both neutrons and
protons
4. both 1. and 2.
5. all of 1., 2., and 3.
Q43.3
What kind of unstable nuclei typically decay by emitting an
alpha particle?
1. those with too many neutrons
2. those with too many protons
3. those with too many neutrons and too many protons
4. misleading question — the numbers of neutrons and
protons in a nucleus are unrelated to whether or not it
emits an alpha particle
A43.3
What kind of unstable nuclei typically decay by emitting an
alpha particle?
1. those with too many neutrons
2. those with too many protons
3. those with too many neutrons and too many protons
4. misleading question — the numbers of neutrons and
protons in a nucleus are unrelated to whether or not it
emits an alpha particle
Q43.4
What kind of unstable nuclei typically decay by emitting a
gamma-ray photon?
1. those with too many neutrons
2. those with too many protons
3. those with too many neutrons and too many protons
4. misleading question — the numbers of neutrons and
protons in a nucleus are unrelated to whether or not it
emits gamma rays
A43.4
What kind of unstable nuclei typically decay by emitting a
gamma-ray photon?
1. those with too many neutrons
2. those with too many protons
3. those with too many neutrons and too many protons
4. misleading question — the numbers of neutrons and
protons in a nucleus are unrelated to whether or not it
emits gamma rays
Q43.5
As a sample of radioactive material decays, the decay rate
1. is directly proportional to the half-life and directly
proportional to the number of radioactive nuclei
remaining
2. is directly proportional to the half-life and inversely
proportional to the number of radioactive nuclei
remaining
3. is inversely proportional to the half-life and directly
proportional to the number of radioactive nuclei
remaining
4. is inversely proportional to the half-life and inversely
proportional to the number of radioactive nuclei
remaining
A43.5
As a sample of radioactive material decays, the decay rate
1. is directly proportional to the half-life and directly
proportional to the number of radioactive nuclei
remaining
2. is directly proportional to the half-life and inversely
proportional to the number of radioactive nuclei
remaining
3. is inversely proportional to the half-life and directly
proportional to the number of radioactive nuclei
remaining
4. is inversely proportional to the half-life and inversely
proportional to the number of radioactive nuclei
remaining
Q43.6
Why does nuclear fusion of hydrogen require high temperatures?
1. positive charges repel each other
2. the nuclear force only acts at short range
3. both 1. and 2.
4. neither 1. nor 2.
A43.6
Why does nuclear fusion of hydrogen require high temperatures?
1. positive charges repel each other
2. the nuclear force only acts at short range
3. both 1. and 2.
4. neither 1. nor 2.