Cities have higher rates of lung disease than rural areas
What will be an ideal response?
Cities have more pollutants in the air and therefore do have higher rates of lung
ailments than rural areas.
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Two 1.5 m-square and parallel flat plates are 30 cm apart. Plate A1 is maintained at a temperature of 1100 K and A2 at 500 K. The emissivities of the plates are 0.5 and 0.8, respectively. Considering the surroundings black at 0 K and including multiple inter-reflections, determine (a) the net radiant exchange between the plates and (b) the heat input required by surface A1 to maintain its temperature. The outer-facing surfaces of the plates are adiabatic.
GIVEN
• Two square parallel flat plates, 30 cm apart
• Temperature of A1 (T1) = 1100 K
• Temperature of A2 (T2) = 500 K
• Emittances: ?1 = 0.5 ?2 = 0.8
• Surroundings are black at (T3) = 0 K
FIND
Including multiple inter-reflections, determine:
(a) The net radiant exchange (q1–2)
(b) The heat input at surface A1 (q1) required to maintain its temperature
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
Briefly explain why antimatter is so difficult to store after it is produced in laboratories.
What will be an ideal response?
What technique for measuring distance can you use to discover Hubble's Law?
A.) Cepheid variables in galaxies. B.) White dwarf supernovae in galaxies. C.) Redshifts of bright objects in galaxies. D.) A and B. E.) All of the above.
For an atom of hydrogen without the effects of an external magnetic field, an electron transition from the 3P subshell to the 2P subshell is called a forbidden transition. Why is this so?