Question 1

Which of the following statements best explains why alpha radiation is considered highly dangerous if ingested but relatively harmless when outside the body?

Accepted Answer

Alpha particles have low penetrating power but high ionizing power.

Question 2

Which nuclear equation correctly represents the alpha decay of uranium-238?

Accepted Answer

$$^{238}_{92}\mathrm{U} \$$rightarrow ^{234}$$_{90}\mathrm{Th} $$+ ^{4}$$_{2}\mathrm{He}$$

Question 3

A radioactive isotope has a half-life of 10 years. If you start with 80 grams, how much remains after 30 years?

Accepted Answer

10 grams

Question 4

Which device is most commonly used for instantaneous detection of radioactivity in a laboratory setting?

Accepted Answer

Geiger-Müller counter

Question 5

Which type of radioactive emission is most likely to penetrate several inches of lead?

Accepted Answer

Gamma rays

Question 6

What is the main difference between nuclear fission and nuclear fusion?

Accepted Answer

Fission splits heavy nuclei, while fusion combines light nuclei.

Question 7

Which of the following best describes the process of radiocarbon dating?

Accepted Answer

Comparing the ratio of carbon-14 to carbon-12 in an artifact to that in living organisms.

Question 8

Which of the following nuclear equations represents beta decay?

Accepted Answer

$$^{14}_{6}\mathrm{C} \$$rightarrow ^{14}$$_{7}\mathrm{N} $$+ ^{0}$$_{-1}\mathrm{e}$$

Question 9

Why is radon gas considered a significant health risk in homes built over uranium-rich soil?

Accepted Answer

Radon and its decay products can be inhaled, exposing lung tissue to alpha radiation.

Question 10

Which scientist(s) first discovered that uranium salts could expose photographic plates without sunlight, leading to the discovery of radioactivity?

Accepted Answer

Antoine-Henri Becquerel

Question 11

What is the effect on the atomic number and mass number of a nuclide when it undergoes positron emission?

Accepted Answer

Atomic number decreases by 1; mass number remains unchanged.

Question 12

Which of the following is a real-world application of gamma radiation in medicine?

Accepted Answer

Treating cancerous tumors by targeting them with gamma rays

Question 13

A sample of carbon-14 has decayed to 12.5% of its original amount. How many half-lives have passed?

Accepted Answer

3

Question 14

Which of the following best explains why nuclear power plants use enriched uranium-235 rather than natural uranium-238?

Accepted Answer

U-235 undergoes fission more readily when bombarded with neutrons.

Question 15

Which of the following is a balanced nuclear equation for the positron emission of phosphorus-30?

Accepted Answer

$$^{30}_{15}\mathrm{P} \$$rightarrow ^{30}$$_{14}\mathrm{Si} $$+ ^{0}$$_{+1}\mathrm{e}$$

Question 16

Which of the following statements about the effects of radiation on living organisms is correct?

Accepted Answer

Acute exposure to high levels of radiation can kill rapidly dividing cells.

Question 17

Which of the following best describes the role of control rods in a nuclear reactor?

Accepted Answer

They absorb neutrons to regulate or stop the fission chain reaction.

Question 18

Which historical event directly led to the end of World War II?

Accepted Answer

The detonation of atomic bombs on Hiroshima and Nagasaki

Question 19

Which of the following is a major challenge associated with nuclear fusion as a source of electricity?

Accepted Answer

Fusion requires extremely high temperatures that current materials cannot withstand.

Chapter 17: Radioactivity and Nuclear Chemistry – Study Notes

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