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7. Radioactivity is: a. The emission and propagation of energy through space or a substance in the form of waves b. The emission and propagation of energy through space or a substance in the form of particles c. The process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear state d. The process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a less balanced nuclear state A B C D 8. Cathode rays are derived from which of the following types of particular radiation? a. Electrons b. Alpha particles c. Protons d. Neutrons A B C D

Question

7. Radioactivity is: a. The emission and propagation of energy through space or a substance in the form of waves b. The emission and propagation of energy through space or a substance in the form of particles c. The process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear state d. The process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a less balanced nuclear state A B C D 8. Cathode rays are derived from which of the following types of particular radiation? a. Electrons b. Alpha particles c. Protons d. Neutrons A B C D

7. Radioactivity is: a. The emission and propagation of energy through space or a substance in the form of waves b. The emission and propagation of energy through space or a substance in the form of particles c. The process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a more balanced nuclear state d. The process by which certain unstable atoms or elements undergo spontaneous disintegration, or decay, in an effort to attain a less balanced nuclear state A B C D 8. Cathode rays are derived from which of the following types of particular radiation? a. Electrons b. Alpha particles c. Protons d. Neutrons A B C D

Solution

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Answer

7. **C** - Radioactivity is the process by which unstable atoms or elements undergo spontaneous disintegration (decay) to achieve a more stable nuclear state. Options A and B describe radiation in general, not specifically radioactivity. Option D is incorrect because the decay aims for a *more* balanced, not less balanced, state.<br /><br />8. **A** - Cathode rays are streams of electrons. Alpha particles are helium nuclei, protons are positively charged particles in the nucleus, and neutrons are neutral particles in the nucleus.<br />
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