According to Wien's Law, a(n) ____
a. hotter object will emit more short wavelength (bluer) radiation
b. hotter object will emit more long wavelength (redder) radiation
c. cooler object will produce less photons
d. cooler object will produce more photons
e. object will produce the same number of photons at different temperatures
a
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Of the objects lister, the one that you do NOT see BECAUSE of REFLECTED light is:
a. A painting b. The moon c. The wall of your home d. The sun
Igneous definition
What will be an ideal response?
In order to conserve energy, the inner surface of double-glazed windows are treated with a low emissivity coating that reduces the emissivity of the uncoated surface from 0.95 to 0.5 for the coated surface. If the temperatures of the two glass panes are 20°C and 0°C, respectively, determine the reduction in heat transfer in a coated double-glazed window as compared with the uncoated one.
GIVEN • Double glazed windows treated with low emissivity coating that reduce emissivity of uncoated surface from ?1 =0.95 to ?2= 0.5. • Temperature of glass pane 1 (T1)= 200C = 293 K • Temperature of glass plane 2 (T2) = 00C = 273 K FIND Reduction in heat transfer in coated double glazed window as compared to uncoated one. PROPERTIES AND CONSTANTS the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
Uranium-235, uranium-238 and uranium-239 are different
A) elements. B) ions of the same element. C) isotopes of the same element. D) none of the above