What causes the release of oxygen into Earth’s atmosphere?
A. vaporization
B. outgassing
C. photosynthesis
Ans: C. photosynthesis
You might also like to view...
How do we know that pulsars must be neutron stars?
A) Pulsars have the same upper mass limit as neutron stars do. B) No massive object, other than a neutron star, could spin as fast as we observe pulsars to spin and remain intact. C) This is only a theory that has not yet been confirmed by observations. D) We have observed massive-star supernovae produce pulsars. E) Telescopic images of pulsars and neutron stars look exactly the same.
A particle is fired at a target nucleus in which a reaction that could occur has a negative Q value. Which of the following statements is true?
a. The kinetic energy of the bombarding particle can be any amount for the reaction to occur. b. The kinetic energy of the bombarding particle must be equal to the absolute value of the Q value for the reaction to occur. c. The kinetic energy of the bombarding particle was greater than the absolute value of the Q value if the reaction occurred. d. The Q value has nothing to do with whether or not the reaction can occur.
Almost all the meteors you see in the sky are produced by meteoroids that weigh _____
A) less than 0.1 grams B) less than 1 gram C) more than 10 grams D) more than 100 grams
Estimate the temperature distribution through a bare 16 gauge copper wire conducting 1.5 amperes of electric current if the surrounding air is at 10ºC and the convective heat transfer coefficient is 65 W/m^2?K.
What will be an ideal response?