Why can't current theories describe what happened during the Planck era?
A) We do not know how hot or dense the universe was during that time.
B) We do not understand the properties of antimatter.
C) We do not yet have a theory that links quantum mechanics and general relativity.
D) The Planck era was the time before the Big Bang, and we cannot describe what happened before that instant.
C
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Plot the Bessel’s function of the first kind of zero and first order, J0 and J1, for arguments from 0 to 10.
What will be an ideal response?
Electrons in atoms move about the nucleus in well defined circular orbits
Indicate whether the statement is true or false
Why do we call dark matter "dark"?
A) It emits no radiation that we have been able to detect. B) It is dark brown or dark red in color. C) It blocks out the light of stars in a galaxy. D) It contains large amounts of dark-colored dust.
The Jovian planets have low density because:
A) they formed in the outer solar nebula where water vapor could freeze to form ice particles. B) interactions between their magnetic fields and the solar wind generate powerful electric currents. C) the continuous blast of micrometeorites evaporates surface ice, leaving behind embedded minerals. D) the heat flowing out of them emits about twice as much less energy as they absorb from the Sun.