Chapter 25, Problem 80A

Interpretation Introduction

Interpretation: A radioisotope with a half-life measured in days can be used in a smoke detector to be explained.

Concept Introduction: The spontaneous emission of rays or particles from specific elements, such as uranium, is referred to as radioactivity. The radioactive isotopes of an element are called radioisotopes. They are atoms with an unstable nuclear configuration of neutrons and protons or excess nuclear energy.

Answer to Problem 80A

The radioisotope used in smoke detector should have a longer half-life.

Explanation of Solution

Smoke detectors are used to limit the deaths or injuries that are caused due to fires,

The radioactive isotope americium s ${}_{95}^{241}\text{Am}$ in the form of ${\text{AmO}}_2$ is used as a smoke detector in houses.

There is the flow of current in the smoke detector when the air is smoke-free.

There is drop-in current in the smoke detector if the smoke is present.

This drop is detected by an electronic circuit, which causes the alarm to sound.

Americium has a half-life of 432.2 years.

The smoke detectors should have a longer life, not in days.

The smoke detectors should have a longer life because they will be useful to detect the fire and work for a longer period.