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Question 1

compton scattering

Answer 1

photon removes electron
re-emitted as longer wavelength

Question 2

what do dielectrics do

Answer 2

increases permitivity which increases capcitance

Question 3

lenzs law

Answer 3

direction of induced emf opposes charge which caused it

Question 4

fuel rod

Answer 4

contains uranium nuclei which undergoes fission when a neutron is absorbed

Question 5

free charged particle

Answer 5

any charge moving in a magnetic field will experience a force perpendicular to the direction of its velocity

Question 6

A-scan

Answer 6

stationary transducer
only measures depth using time to reflect

Question 7

control rod

Answer 7

absorbs neutrons, no fission

Question 8

gamma ray scintillator

Answer 8

absorbs gamma photons and re-emits many visible photons

Question 9

binding energy

Answer 9

energy required to split a nucleus into its constituent nucleons

Question 10

attenuated

Answer 10

absorbed, reduced intensity

Question 11

what is EMF

Answer 11

energy supplied to each unit charge

Question 12

motor effect

Answer 12

current-carrying wire in a magnetic field will experience a force

Question 13

faradays law

Answer 13

induced EMF is proportional to rate of change of flux linkage

Question 14

simple generator

Answer 14

spinning coil in a magnetic field

Question 15

electric potential

Answer 15

energy required to move a unit charge from infinity to a point

Question 16

gamma ray photomultiplier tubes

Answer 16

concerts photons energy into electrical signal

Question 17

moderator

Answer 17

slows neutrons down so they are able to be absorbed by uranium nuclei in another rod

Question 18

PET process

Answer 18

positron rich substance is injected
positrons annihilate electrons
pair of photons are produced
photon pair is detected by detectors
point of origin is calculated
image produced

Question 19

transducer

Answer 19

produces the ultrasound by applying a varied p.d. to an array of piezoelectric crystals. crystals vibrate, this is detected and an image is produced

Question 20

what happens when two mediums have equal impedance

Answer 20

they’re acoustically matched, so no sound is reflected

Question 21

B scan

Answer 21

multiple a-scans when moving sideways
2D image is produced

Question 22

CAT process

Answer 22

rotating x-ray tube around patient
rays are detected by detectors
detectors build 2D cross section images

Question 23

2 non invasive processes

Answer 23

x-ray, MRI

Question 24

invasive process

Answer 24

surgery

Question 25

coulombs law

Answer 25

force between two charge particles is proportional to the product of their charges and inversely proportional to the square of their separation