An X-ray burster occurs in a pulsar when ____
a. accreted helium suddenly fuses in a nova-like explosion
b. the Chandrasekhar limit is exceeded and the object collapses
c. carbon deflagration destroys the object
d. it merges with a binary companion
e. hydrogen fusion ignites in an accretion disk around it
a
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The circles in the picture below are Gaussian surfaces. All other lines are electric field lines. For which cases is the flux non-zero?
The extent to which Mars has been habitable essentially boils down to the
A) question of whether liquid water has ever been present on its surface B) question of whether oceans of liquid water have existed on its surface C) amount of water that has been present on its surface D) length of time liquid water has been present at or below its surface
Which of the patterns shown below would appear on a screen when monochromatic light first passes through a narrow slit for which a = ? and then strikes the screen? Note that the darkest area in each illustration represents the brightest area on the screen.
A.
B.
C.
D.
E.
Light of wavelength 400 nm falls on a metal surface having a work function 1.70 eV
What is the maximum kinetic energy of the photoelectrons emitted from the metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s = 4.141 × 10-15 ev ? s, 1 eV = 1.60 × 10-19 J) A) 1.41 eV B) 1.70 eV C) 3.11 eV D) 2.82 eV E) 4.52 eV