Question

Choose which of the following statements about nuclear changes, radioisotopes and radioactivity are true (note, there are more than one correct answer).

1. The half life of different radioisotopes like uranium-235, hydrogen-3 (tritium), and carbon-14 is basically the same

2. Nuclear fission is essentially a controlled chain reaction of a radioisotope like U-235, while a nuclear explosion is an example of an uncontrolled chain reaction

3. Nuclear fusion isa much easier way to produce useful energy, but it creates far more harmful wastes than nuclear fission

4. The half life measures how long it takes for half of the radioisotope atoms to break down (decay)

5. Some radioisotopes are relatively harmless compared to others

Answer 1