Definitions medical physics, MF, nuclear phy

Question 1

attentuation

Answer 1

loss in power pf a radiation as it passess through living matter

Question 2

Hardness

Answer 2

measures the penetration of the beam

Question 3

Contrast

Answer 3

Diff in degree of blackening of structures

Question 4

Specific acoustic impedance

Answer 4

product of density and speed, speed of ultrasound in medium .

Question 5

Magentic flux linkage

Answer 5

prdouct of magnetic flux density x area, magnetic flux density normal to area and multiply by no of turns on a coil

Question 6

Tesla

Answer 6

when a force of 1N acts on a charge of 1C which is moving at a speed of 1m/s in a direction perpendicular to the the field then the strength of the magnetic field is 1 tesla

Question 7

Magnetic flux density

Answer 7

force per unit length on a straight conductor carrying unit current which is normal to the field.

Question 8

smoothing

Answer 8

output voltages does not fall to zero

Question 9

radioactive decay

Answer 9

spontaneous emission of unstable nucleus to form a more stable nucleus resulting in the emission of an alpha, beta or gamma particle,

Question 10

gravitational field strength

Answer 10

force per unit mass

Question 11

Faraday’s law

Answer 11

(induced) e.m.f. (directly) proportional to rate

of change of magnetic flux (linkage)

Question 12

R.m.s value of an alternating current

Answer 12

the steady current that produces the same heating effect (as the alternating current)

Question 13

Photon

Answer 13

quantum of energy of EM radiation