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Basic Physics for Radiography Lecture

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Questions and Answers

What is the focus of the lecture Basic Physics for Radiography?

Defining units in relation to their relevance to radiography (correct)

Identifying different forms of energy

Defining the concepts of force and acceleration

Explaining how heat energy is moved around

Why is it mentioned that radiography works due to the underlying physics?

To encourage using basic physics principles in radiography

To show that the laws of physics are not relevant to radiography

To emphasize the importance of technology in radiography

To highlight the consistency of physics laws in all technologies (correct)

What are the three ways heat energy can be moved around, as mentioned in the lecture?

Conduction, convection, transmission

Conduction, convection, radiation (correct)

Transmission, convection, dispersion

Conduction, transmission, radiation

According to the lecture, why is it important to define the seven base units in relation to their relevance to radiography?

To understand how units apply to radiography Signup and view all the answers

What is the purpose of defining the concepts of force and acceleration in relation to Newton's three laws?

To show the relevance of Newton's laws to radiography Signup and view all the answers

Why does the lecturer encourage writing down the learning objectives at the start of the lecture?

To provide a nice hook for students to practice defining terms Signup and view all the answers

What is the purpose of cooling the coils with liquid helium in an MRI machine?

To generate strong magnetic fields Signup and view all the answers

What is the temperature to which the coils surrounding the magnets in an MRI machine are cooled using liquid helium?

Minus 270 degrees centigrade Signup and view all the answers

What is velocity?

The rate of change of position with respect to time Signup and view all the answers

What is acceleration?

The rate of change of velocity with respect to time Signup and view all the answers

In the context of radiography, how are electrons accelerated in an x-ray tube?

They are accelerated to quite a high fraction of the speed of light Signup and view all the answers

What is the formula for acceleration when calculating the change in velocity over time?

$Vf - V0 / T$ Signup and view all the answers

What happens to velocity over time if acceleration is positive?

Velocity increases over time Signup and view all the answers

What is the unit of acceleration?

$(m/s)^2$ Signup and view all the answers

In radiologic science, why is it important to understand basic physics concepts?

To underpin a lot of radiologic science Signup and view all the answers

Why do the coils surrounding the magnets in an MRI machine need to be cooled to very low temperatures?

To allow them to have no resistance to electricity and generate strong magnetic fields Signup and view all the answers