One reason a photon could not create an odd number of electrons and positrons is that such a process would
A)
not conserve charge.
B)
not conserve energy.
C)
require photon energies that are not attainable.
D)
result in the creation of mass.
E)
result in the destruction of mass.
A
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The Planck era refers to the time period
A) before the Big Bang. B) before the Planck time. C) after the Planck time. D) after inflation. E) after the GUT era.
A circuit contains two inductors of 6.0-mH inductance in parallel placed in series with an inductor of 8.0-mH inductance. After one of the 6.0-mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?
A. 3.0 mH B. 3.4 mH C. 4.8 mH D. 11 mH E. 20 mH
If the collision is elastic, how many equations of constraint do we have on those quantities?
A. Zero B. One C. Two D. Three E. Four
Why do some radio galaxies appear to have lobes while some do not
What will be an ideal response?