Which of the following statements is true of type I supernovae?
A) They occur when a white dwarf has a lower mass than the Chandrasekhar limit.
B) They appear to be produced by the collapse and explosion of a massive star.
C) They are seen as a dimming star from Earth.
D) They have no hydrogen lines in their spectra.
D
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Conduction electrons move to the right in a certain wire. This indicates that:
A) the current density points left but the direction of the electric field is unknown B) the current density and electric field both point right C) the current density and electric field both point left D) the current density points right and the electric field points left E) the current density points left and the electric field points right
What evidence do we have that life arose quickly?
What will be an ideal response?
A ball is thrown straight up with a speed of 36 m/s. How long does it take to return to its starting point, assuming no air?
A) 3.7 s B) 7.3 s C) 11 s D) 15 s
A particle with an integer spin is a
a. boson b. lepton c. fermion d. hadron e. muon