EW300 Final Exam Prep UPDATED
QUESTIONS AND CORRECT ANSWERS
Wien's Law - CORRECT ANSWER Calculates wavelength of maximum radiation
Planck's Law - CORRECT ANSWER Dictates the shape of the spectral radiant emittance vs.
wavelength curve as a function of temperature and wavelength
Stefan-Boltzmann's Law - CORRECT ANSWER Gives us the area under the curve, or exitance
Beer-Lambert Law - CORRECT ANSWER Gives us the transmittance as a function of
wavelength, environmental attenuation factors, and range to target
Laser Characteristics - CORRECT ANSWER Coherent, Low Divergence (Collimated),
Inneficient, Monochromatic
Common Military Applications for Lasers - CORRECT ANSWER Designating targets,
dazzling, range approximation, directed energy weapons
Reflection - CORRECT ANSWER When an EM wave strikes a conductive surface and bounce
off it at an angle equal to the incident angle
Diffraction - CORRECT ANSWER The tendency of EM waves to spread out, or bend around
objects
Refraction - CORRECT ANSWER When an EM wave passes into a medium with a different
speed of propagation, and the EM wave bends towards/into the medium of slower wave propagation
What unit of measure is most commonly used to describe the Electro-Optical Spectrum - CORRECT
ANSWER micrometer or "microns"
What type of interference occurs when EM waves interact with one another and the resultant wave
increases in amplitude? - CORRECT ANSWER Constructive
, What is thermal crossover? - CORRECT ANSWER When the environmental heating cycle
causes target temperature = environment temperature (no contrast)
The Beer-Lambert Law accounts for which type(s) of attenuation: - CORRECT
ANSWER Absorption and Scattering
What variable accounts for the detector's sensitivity to specific wavelengths of emitted energy? -
CORRECT ANSWER Bandwidth factor
A difference in starting point between two EM waves is a difference in - CORRECT
ANSWER phase angle
A low level light vision system requires - CORRECT ANSWER Light reflected off the object
________ converts ideal exitance into actual material exitance by accounting for differences in
blackbody vs. graybody properties - CORRECT ANSWER Emmissivity
Frequency and wavelength are __________ proportional - CORRECT ANSWER inversely
Rest Time (RT) - CORRECT ANSWER the non-transmit time or interval between
electromagnetic pulses
Pulse Width (PW) - CORRECT ANSWER the active transmit time or duration of the
electromagnetic pulse
Pulse Repetition Time (PRT) - CORRECT ANSWER the total time for one transmission cycle
Pulse Repetition Frequency (PRF) - CORRECT ANSWER Number of pulses transmitted per
second
Peak Power (Ppk) - CORRECT ANSWER the maximum power transmitted by a RADAR
QUESTIONS AND CORRECT ANSWERS
Wien's Law - CORRECT ANSWER Calculates wavelength of maximum radiation
Planck's Law - CORRECT ANSWER Dictates the shape of the spectral radiant emittance vs.
wavelength curve as a function of temperature and wavelength
Stefan-Boltzmann's Law - CORRECT ANSWER Gives us the area under the curve, or exitance
Beer-Lambert Law - CORRECT ANSWER Gives us the transmittance as a function of
wavelength, environmental attenuation factors, and range to target
Laser Characteristics - CORRECT ANSWER Coherent, Low Divergence (Collimated),
Inneficient, Monochromatic
Common Military Applications for Lasers - CORRECT ANSWER Designating targets,
dazzling, range approximation, directed energy weapons
Reflection - CORRECT ANSWER When an EM wave strikes a conductive surface and bounce
off it at an angle equal to the incident angle
Diffraction - CORRECT ANSWER The tendency of EM waves to spread out, or bend around
objects
Refraction - CORRECT ANSWER When an EM wave passes into a medium with a different
speed of propagation, and the EM wave bends towards/into the medium of slower wave propagation
What unit of measure is most commonly used to describe the Electro-Optical Spectrum - CORRECT
ANSWER micrometer or "microns"
What type of interference occurs when EM waves interact with one another and the resultant wave
increases in amplitude? - CORRECT ANSWER Constructive
, What is thermal crossover? - CORRECT ANSWER When the environmental heating cycle
causes target temperature = environment temperature (no contrast)
The Beer-Lambert Law accounts for which type(s) of attenuation: - CORRECT
ANSWER Absorption and Scattering
What variable accounts for the detector's sensitivity to specific wavelengths of emitted energy? -
CORRECT ANSWER Bandwidth factor
A difference in starting point between two EM waves is a difference in - CORRECT
ANSWER phase angle
A low level light vision system requires - CORRECT ANSWER Light reflected off the object
________ converts ideal exitance into actual material exitance by accounting for differences in
blackbody vs. graybody properties - CORRECT ANSWER Emmissivity
Frequency and wavelength are __________ proportional - CORRECT ANSWER inversely
Rest Time (RT) - CORRECT ANSWER the non-transmit time or interval between
electromagnetic pulses
Pulse Width (PW) - CORRECT ANSWER the active transmit time or duration of the
electromagnetic pulse
Pulse Repetition Time (PRT) - CORRECT ANSWER the total time for one transmission cycle
Pulse Repetition Frequency (PRF) - CORRECT ANSWER Number of pulses transmitted per
second
Peak Power (Ppk) - CORRECT ANSWER the maximum power transmitted by a RADAR
