7 Radioactivity SAQ1
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Questions and Answers

What is the definition of radioactivity?

The spontaneous breaking up of certain unstable nuclei, accompanied by the emission of radiation.

What is the main difference between isotopes of the same element?

Different mass numbers.

What is the significance of the half-life of a radioactive isotope?

It is the time taken for half the atoms in a sample of the isotope to decay.

What happens to the atomic number of an isotope when it undergoes beta emission?

<p>It increases by 1.</p> Signup and view all the answers

What are two examples of radioisotopes used in medicine and archaeology?

<p>Cobalt-60 and Carbon-14.</p> Signup and view all the answers

What is the purpose of a Geiger-Muller tube?

<p>To detect radiation.</p> Signup and view all the answers

What is the result of alpha decay on an isotope's atomic and mass numbers?

<p>The atomic number decreases by 2 and the mass number decreases by 4.</p> Signup and view all the answers

Who continued Henri Becquerel's pioneering work on radioactivity?

<p>Marie and Pierre Curie</p> Signup and view all the answers

What is an application of radioisotopes in cancer treatment?

<p>Cobalt-60 is used in cancer treatment.</p> Signup and view all the answers

How do the atomic number and mass number change during beta emission?

<p>The atomic number increases by 1 and the mass number remains the same.</p> Signup and view all the answers

What is the significance of Carbon-14 in archaeology?

<p>Carbon-14 is used to date organic materials.</p> Signup and view all the answers

What are the properties of alpha particles?

<p>Positive charge, poor penetrating ability, deflected by electric and magnetic fields.</p> Signup and view all the answers

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