MeV, consistent with graph Quiz

What binding energy value is stated in part (a) as consistent with the graph?

• 1.112 MeV
• 260 MeV
• 7.680 MeV
• 7.520 MeV

The value in part (b) is not significantly different but is sufficiently lower to allow decay into a nuclide that is:

• radioactive
• less tightly bound
• unbound
• more tightly bound

According to the answer key, a negative binding energy implies the system is:

• spontaneous
• stable
• tightly bound
• unbound

What does the answer say about the assumption that it is two bound neutrons?

• It is stable
• It is spontaneous
• It is correct
• It is incorrect

According to the key, the greatest known atomic masses are about:

• 1000
• 500
• 260
• 100

The result found in part (a) for the mass is described as:

• extremely large
• very small
• zero
• reasonable

What does negative energy imply about the reaction?

• It is impossible
• It is spontaneous
• Energy input is necessary
• It releases energy

Even though conservation laws are obeyed, energy must be supplied, so the assumption of spontaneous decay is:

• unnecessary
• proven
• incorrect
• correct

To two significant figures, the values in the problem are described as:

• all alike
• all different
• decreasing
• increasing

When a nucleus emits a particle with -1 charge, the nuclear charge must:

• increase by +2
• decrease by 1
• increase by +1
• stay the same

In part (a), why is the reaction NOT valid?

• Neither applies
• Both conserved
• Nucleon number not conserved
• Charge not conserved

In part (a), the nucleon number relationship 238 = 234 + 4 shows that nucleon number is:

• conserved
• negative
• doubled
• not conserved