4. Positron sources are used in PET scans (PET = positron emission tomography), which are an important part of medical imaging used in diagnosis. One isotope used in PET scans is carbon-11, which decays as shown here: 5 11 6 11 ₁₁ Ce+₁ B Recall that during beta emission, a neutron decays into a proton. Based on the decay equation for ₁₁ C, what change must be happening within the nucleus during positron emission? (-1 pts) Incorrect. (0/1pts) 5. A tiny percent of all naturally-occurring carbon atoms on Earth are carbon-14. Trees (and all living things) incorporate C-14 into their bodies when alive, but this ceases at death, after which the amount of C-14 present gradually decreases due to nuclear decay. Wooden artifacts from long ago can be dated by the percent of carbon-14 remaining in them. A sample of a wooden object from an archaeological site contains only 12.5% of the level of carbon-14 expected for a live tree. How many half-lives have passed since that piece of wood was a living tree? (-1 pts) Incorrect. (0/1pts) 6. Approximately how much time has passed since that piece of wood was a living tree? (See Table NU.3. in the lab manual) (-1 pts) Incorrect. Choose... Choose... Choose... Report Table NU.3: Time Data Effect of time on measured counts per minute Source Item used Counts at 1 minute Counts at 2 minutes Counts at 5 minutes fiesta-ware plate 164 321 886
4. Positron sources are used in PET scans (PET = positron emission tomography), which are an important part of medical imaging used in diagnosis. One isotope used in PET scans is carbon-11, which decays as shown here:
611C⟶10e+511B116C⟶01e+115B
Recall that during beta emission, a neutron decays into a proton. Based on the decay equation for 611C116C, what change must be happening within the nucleus during positron emission?
5. A tiny percent of all naturally-occurring carbon atoms on Earth are carbon-14. Trees (and all living things) incorporate C-14 into their bodies when alive, but this ceases at death, after which the amount of C-14 present gradually decreases due to nuclear decay. Wooden artifacts from long ago can be dated by the percent of carbon-14 remaining in them. A sample of a wooden object from an archaeological site contains only 12.5% of the level of carbon-14 expected for a live tree. How many half-lives have passed since that piece of wood was a living tree?
6. Approximately how much time has passed since that piece of wood was a living tree? (See Table NU.3. in the lab manual)
![4. Positron sources are used in PET scans (PET = positron emission tomography), which are an important part of
medical imaging used in diagnosis. One isotope used in PET scans is carbon-11, which decays as shown here:
5
11
6
11
₁₁ Ce+₁ B
Recall that during beta emission, a neutron decays into a proton. Based on the decay equation for ₁₁ C, what change
must be happening within the nucleus during positron emission?
(-1 pts) Incorrect.
(0/1pts)
5. A tiny percent of all naturally-occurring carbon atoms on Earth are carbon-14. Trees (and all living things)
incorporate C-14 into their bodies when alive, but this ceases at death, after which the amount of C-14 present
gradually decreases due to nuclear decay. Wooden artifacts from long ago can be dated by the percent of carbon-14
remaining in them. A sample of a wooden object from an archaeological site contains only 12.5% of the level of
carbon-14 expected for a live tree. How many half-lives have passed since that piece of wood was a living tree?
(-1 pts) Incorrect.
(0/1pts)
6. Approximately how much time has passed since that piece of wood was a living tree? (See Table NU.3. in the lab
manual)
(-1 pts) Incorrect.
Choose...
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![Report Table NU.3: Time Data
Effect of time on measured counts per minute
Source
Item used
Counts at 1 minute
Counts at 2 minutes
Counts at 5 minutes
fiesta-ware plate
164
321
886](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fab8d4f87-dd9c-411b-b27a-6383a123458b%2Fa0b8e94b-fcff-45c6-88a0-1690cde4ba16%2Fhnukfl4a_processed.png&w=3840&q=75)
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