The material that accretes onto a neutron star or black hole is expected to emit X-rays because
a. the material will produce synchrotron radiation.
b. hydrogen nuclei begin to fuse and emit high-energy photons.
c. the material will become hot enough that it will radiate most strongly at X-ray wavelengths.
d. as the material slows down it converts thermal energy to gravitational potential energy.
e. None of the other choices are correct.
c
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In a double-slit experiment, the distance between the slits is 0.2 mm, and the distance to the screen is 150 cm. What wavelength (in nm) is needed to have the intensity at a point 1 mm from the central maximum on the screen be 80% of the maximum intensity?
a. 900 b. 700 c. 500 d. 300 e. 600
Any indication of prehistoric life preserved in rock is called
a. a shale. b. a radionuclide. c. a fossil. d. none of these.
If a net force of 30 newtons is applied to a cart of mass 3 kg at rest, the velocity of the cart at the end of 5 meters will be ____ m/s
a. 5 b. 10 c. 12 d. 25 e. 30
All reversible engines operating between the same two temperatures have the same efficiency
Indicate whether the statement is true or false