APBI 244 / GEOB 204 Question and answers correctly solved
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APBI
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APBI
APBI 244 / GEOB 204 Question and answers correctly solved
Direction of wind - correct answer Winds are named after the direction from which the air is moving.
Radiant energy - correct answer Electromagnetic waves (Sun, hot fire, clouds, walls of tent).
Sensible heat - correct answer ...
APBI 244 / GEOB 204 Question and
answers correctly solved
Direction of wind - correct answer ✔Winds are named after the direction from
which the air is moving.
Radiant energy - correct answer ✔Electromagnetic waves (Sun, hot fire,
clouds, walls of tent).
Sensible heat - correct answer ✔Thermal energy we can feel (warm air).
Latent heat - correct answer ✔Due to phase changes of a substance,
especially water (cooling we feel after getting out of the swimming pool).
Chemical energy - correct answer ✔Fixed in conversion of CO2 to
carbohydrate (CH2O) (photosynthesis).
Kinetic - correct answer ✔Due to motion (winds).
Geopotential - correct answer ✔Due to postion in gravitational field.
Heat - correct answer ✔The thermal energy content of a body. Expressed as
energy, often also per unit mass or per unit volume of a substance. (i.e. J, or J
kg-1 or J m-3)
Temperature - correct answer ✔The ability of a body to transfer thermal
energy to another body. It is a measure of the random kinetic energy of its
molecules (in K).
,State changes of water - correct answer ✔Melting, evaporation, freezing,
condensation.
Latent heat of vaporization - correct answer ✔Conversion from latent to
sensible heat in a storm cloud is equivalent to the energy evolved from a small
nuclear bomb.
This is simply based on the amount of latent heat picked up at the surface
through evaporation released as water vapour condenses back into liquid
water or freezes into ice.
Latent heat of fusion - correct answer ✔Sprayed liquid water releases latent
heat of fusion as it becomes ice - this prevents a damaging drop in
temperature of almonds
Radiation - correct answer ✔Electromagnetic waves
Conduction - correct answer ✔Molecular motion
Convection - correct answer ✔Mass movement in a fluid
Free convection - correct answer ✔There are free and forced types of
convection.
Energy Flux - correct answer ✔Equivalence between energy and heat.
Power, heat flux - correct answer ✔Is rate of work or the flow rate of energy.
,Heat flux density - correct answer ✔Is flow rate of latent or sensible heat per
unit (surface) area.
Organism-environment interactions - correct answer ✔Transfer of heat and
mass Q can be expressed simply as:
Q = (Cs-Ca)/r
Cs: organism surface concentration
Ca: ambient concentration
r: resistance
Conservation of energy and mass - correct answer ✔One of the most
powerful laws used in analyzing organism - environment interaction is the law
of conservation.
Law of conservation - correct answer ✔Neither mass nor energy can be
created or destroyed by any ordinary means.
Energy Balance of a vegetated surface - correct answer ✔Q* =
QH+QE+QG+QP
* = net all wave radiative flux density
H = sensible heat flux density
E = latent heat flux density
G = soil heat flux density
P = photosynthesis
Energy conservation - correct answer ✔Continually being converted from
one form to another, but none is lost
, Heat flux units vs heat flux density - correct answer ✔Js^-1 vs. Jm^-2
Characteristics of Radiation - correct answer ✔1. Emission of energy as
electromagnetic waves
2. Can travel in a vacuum (space)
3. Travels in straight lines
4. Travels at speed of light
Short wave (solar) - correct answer ✔0.15 um - 3 um
Longwave (thermal IR) - correct answer ✔3 um - 100 um
Far infrared radiation/therma IR
Exchanged between sky, surface and all surrounding objects
Objects emit radiation (emittance) according to SteB equation
Mass Flux density - correct answer ✔Flow rate of mass per unit surface area
kg/sm^2
Radiant flux density - correct answer ✔Flow rate of radiative energy per unit
surface area W/m^2
Wave like property of radiation - correct answer ✔λ distance between crests
Frequency v in s^-1
v = c/ λ
c = speed of light
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