The primary cause of death from the Hiroshima bomb was
A. radiation-induced cancer
B. the blast from the bomb
C. fallout from the bomb
D. smoking induced by fear of the bomb
Answer: B. the blast from the bomb
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One theory for the origin of life suggests that life was transported to Earth in meteorites. This is referred to as
A) naturism B) intelligent design C) panspermia D) chemical evolution
What is the threshold energy for production of a pair of muons, each of mass 207 mo?
What will be an ideal response?
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
Jupiter's interior is mostly liquid helium
Indicate whether the statement is true or false