Non-ionizing

Question 1

Define Electric Field Strength

Answer 1

vector force per unit charge on a point charge at a point in space. It is usually symbolized as E and has units of volts/meter

Question 2

Define Magnetic Field Strength

Answer 2

Vector quantity usually symbolized as H that represents the quotient of the magnetic flux density (symbolized by B) by the permeability of the medium (symbolized by u)

Question 3

Define Poynting vector

Answer 3

vector (cross) product of the electric and magnetic field strengths, and is given by ExH=EHSin(theta)

Question 4

State an example of ELF electromagnetic radiation

Answer 4

50-60 Hz radiation resulting from the generation, propagation, and use of common household, commercial and industrial alternating current.

Question 5

Radiant Energy

Answer 5

Joules. Radiant energy is energy in the form of electromagnetic waves usually expressed in Joules

Question 6

Radiant Power

Answer 6

Radiant Power is the time rate of flow of radiant energy which is expressed in Watts, W

Question 7

Radiant intensity

Answer 7

Radiant intensity is the radiant power in a given direction or radiant flux emitted from the source per unit solid angle (Steradian), in the direction of propagation which is usually expressed in watts/steradian.

Question 8

Radiance

Answer 8

Radiance is radiant flux (radiant power) output per unit solid angle per unit area in units of Watts per Steradiant cm2. Radiance is also known as radiometric brightness W Sr-1 cm-2

Question 9

Radiant exposure

Answer 9

Radiant exposure is the total energy per unit area incident upon a given surface in a given interval of time. This unit is used to express exposure dose to pulsed laser radiation and it is usually expressed in units of Joules per cm2