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Pair annihilation of an electron and a positron occurs in a positron emission tomography (PET) scanner - Leaving Cert Physics - Question 1 - 2022

Question 1

Pair annihilation of an electron and a positron occurs in a positron emission tomography (PET) scanner. Write an equation for this annihilation. or Draw the symbol... show full transcript

Worked Solution & Example Answer:Pair annihilation of an electron and a positron occurs in a positron emission tomography (PET) scanner - Leaving Cert Physics - Question 1 - 2022

Step 1

Write an equation for this annihilation.

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Answer

The process of pair annihilation can be represented by the following equation:

$e^- + e^+ \rightarrow 2\gamma$

This shows that an electron ( $e^-$ ) and a positron ( $e^+$ ) annihilate to produce two photons ( $\gamma$ ).

Step 2

Draw the symbol for an AND gate.

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Answer

The symbol for an AND gate is represented as follows:

  _______
 |       |
 |   &   |
 |_______|

Truth Table for an AND Gate

The truth table for an AND gate is:

A	B	A AND B
0	0	0
0	1	0
1	0	0
1	1	1

In this table, the output is true (1) only when both inputs A and B are true (1).

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