A neutral atom has an electron configuration of 1s22s22p63s23p2. What is its atomic number?
A)
5
B)
11
C)
14
D)
20
E)
26
C
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If the mass of a body were doubled, its gravity would become 4 times stronger
Indicate whether the statement is true or false
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)= 20°C = 293 K
? Temperature of glass plane 2 (T2) = 0°C = 273
FIND
Reduction in heat transfer in coated double glazed window as compared to uncoated one.
PROPERTIES AND CONSTANTS
From Appendix 1, Table 5, the Stephan-Boltzmann constant
The first stage in planetary evolution is cratering
a. True b. False Indicate whether the statement is true or false
The activity of a radioactive source is often
measured in a unit called? a) the joule b) the u c) the microgram d) the cpm