X Ray Circuit

Question 1

when are x rays produced

Answer 1

when high speed elections suddenly undergo change in direction

Question 2

what does an x ray tube convert

Answer 2

its input of electrical energy into an output of x ray energy

Question 3

what are the 3 things an x ray tube provides

Answer 3

1. electrons which are free to move
2. means of getting these electrons to travel at high speed
3. force causing these fast moving electrons suddenly to change direction

Question 4

what is thermionic emission controlled by

Answer 4

• high temperature
• tungsten
• fine coil SA

Question 5

when does space charge effect occur

Answer 5

occurs if body electrically neutral before application of HEAT –> electrons leave body as result

Question 6

when is the state of equilibrium reached after electrons leave body

Answer 6

achieved after a short period of time
- electrons attracted back to same state at which they were emitted

Question 7

what happens when the exposure button fully pressed?

Answer 7

• high electrical pd is applied across tube
• anode +ve and -ve cathode
• electrons gain kinetic energy
• electrons travel freely in vacuum

Question 8

what is the target made of

Answer 8

tungsten

Question 9

what causes electron sudden change in direction

Answer 9

• targets nuclei exert strong +ve attractive forces bc of high number of protons

Question 10

what is the voltage across filament

Answer 10

10-12 volts

Question 11

what is required to supply low voltage and high heating current

Answer 11

step down transformer

Question 12

what is an autotransformer

Answer 12

a single wire (self-induction) that compensates for any mains fluctuations