Physics Basics From Book Mri In Practice Chapter 1

Front 1

true or false/ Adding or removing protons from the nucleus of an atom creates a different element?

Back 1

TRUE

Front 2

What is the Mass Number?

Back 2

An element's or isotope's mass number tells how many protons and neutrons in its atoms.

Front 3

What is the Atomic Number?

Back 3

An element's or isotope's atomic number tells how many protons are in its atoms.

Front 4

Neutrons are all identical to each other, just as protons are.

Back 4

TRUE

Front 5

Atoms of a particular element must have the same number of protons but can have different numbers of neutrons.

Back 5

TRUE

Front 6

When an atom does not have the same number of protons and neutrons, it is called an

Back 6

isotope

Front 7

An element's or isotope's atomic number tells how many protons are in its atoms.

Back 7

TRUE

Front 8

An element's or isotope's mass number tells how many protons and neutrons in its atoms.

Back 8

TRUE

Front 9

Electrons

Back 9

Electrons spin and rotate around the outside of the nucleus.

Front 10

As the electrons circle the nucleus they travel at certain energy levels but can "jump" between different energy levels if they gain or lose energy.

Back 10

TRUE

Front 11

ATOM

Back 11

An atom is the smallest particle of any element that still retains the characteristics of that element.

Front 12

DEFINE AN ELEMENT

Back 12

All matter, such as solids, liquids and gases, is composed of atoms. Any material that is composed of only one type of atom is called a chemical element, a basic element, or just an element.

Front 13

The atoms of one element are different from those of all other element.

Back 13

TRUE

Front 14

Compounds are made when atoms of different elements are chemically combined together.

Back 14

TRUE

Front 15

two electrons spinning and orbiting in opposite direction

Back 15

PAIRED ELECTRONS

Front 16

The overall magnetic field strength of atoms with all paired electrons equals?

Back 16

zero.

Front 17

In general, materials that have all paired electrons in the atoms and thus have no net magnetic moment are called ?

Back 17

diamagnetic materials

Front 18

Most materials with one or more unpaired electrons are at least slightly magnetic. Materials with a small attraction to a magnet are called 1.________ _______, and those with a strong attraction are called 2._________ __________.

Back 18

1. paramagnetic materials
2. ferromagnetic materials.

Front 19

1. What are some paramagnetic materials?
2, What are some ferromagnetic materials?

Back 19

1. Aluminum, platinum, and manganese
2. Iron, cobalt, and nickel.

Front 20

A magnetic field

Back 20

A magnetic field describes a volume of space where there is a change in energy

Front 21

The spinning and orbiting of the nucleus of an atom produces a magnetic field . The strength of this field is called the ?

Back 21

magnetic moment.

Front 22

gyro magnetic rotation in 1 Tesla

Back 22

42.58 [MHz/T]

Front 23

Larmar Equation

Back 23

Processional Frequency = Gyro Magnetic Ratio x Main Magnetic Field (or)
{MHz] = [MHz/T] x [T] (or)
Wo = d x Bo (or)
Wo = 42.58 x Bo

Front 24

A molecule

Back 24

A molecule is a group of atoms bunched together.