For photovoltaic cells, the potential difference for two silicon cells in series will at most be ________
a. 0.1 b. 0.5 c. 1.0 d. 2.0 e. 5.0 volts.
c
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Blood as it enters the lungs has a high concentration of carbon dioxide and a low concentration of oxygen. The blood leaves the lungs with a high concentration of oxygen and a low concentration of carbon dioxide. What are the qualitative concentration gradients of CO2 and O2 in the lungs?
What will be an ideal response?
About how many potentially hazardous asteroids pass within 0.05 AU of the Earth per decade in modern times?
A) None B) 10-20 C) 200-300 D) 5000-1000 E) A completely unknown quantity; it could easily be anywhere from just a few to millions.
Two point charges of values +2.0 and +5.5 ?C, respectively, are separated by 0.50 m. What is the potential energy of this 2-charge system? (ke = 8.99 × 10^9 N?m2/C2)
a. +0.50 J b. ?0.20 J c. +0.20 J d. ?0.41 J e. +0.41 J
What is the mass of a mole of oxygen gas?
a. 8 g c. 24 g b. 16 g d. 32 g