WorksheetsPart 1: Fundamentals of Radiation
Total questions: 7
Worksheet time: 4mins
Which statement best identifies the wavelength band most associated with thermal radiation relevant to heat transfer studies?
Primarily 0.40–0.76 μm visible light
Mostly 0.76–100 μm infrared region
Entire 0.01–0.40 μm ultraviolet range
Predominantly 10^2–10^4 μm microwaves
Which property describes how a blackbody emits radiation spatially?
Uniformly in all directions, diffuse emission
Predominantly along the surface normal only
Concentrated into a narrow specular cone
Strongly peaked in one preferred direction
Identify the correct form of the Stefan–Boltzmann law for blackbody emissive power.
Eb(T) = σ ln(T)
Eb(T) = σ/T
Eb(T)=σT2
Eb(T)=σT4
Which value corresponds to the Stefan–Boltzmann constant σ?
5.670 × 10^−8 W/m·K
6.626 × 10^−34 J·s
5.670×10−8W/m2⋅K4
1.381×10−23 J/K
Which material typically shows high emissivity ε close to 0.95?
Tinted glass has high emissivity
Polished silver has high emissivity
Clear glass has high emissivity
Human skin has high emissivity
Which relation holds for reflectivity ρ of an opaque surface in terms of absorptivity α?
ρ equals α divided by two
ρ equals one plus α
ρ equals α times emissivity
ρ equals one minus α
Which material would most likely have τ ≈ 0.9 indicating high transmissivity?
Wood shows high transmissivity
Clear glass shows high transmissivity
Human skin shows high transmissivity
Black paint shows high transmissivity
