A unit that measures the effective dose of radiation in a human is the
A)
curie.
B)
RBE.
C)
rad.
D)
rem.
E)
sievert.
D
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A method for identifying a black hole is to
A. look for voids (holes) in the star fields. B. search for radio waves from the accretion disk. C. look for its effect on nearby companions. D. observe them directly through the space-based telescopes.
________ is the most significant force that determines the evolution of stars.
A. Energy B. Gravity C. Luminosity D. Temperature
Intensity: A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy that falls upon it. The other vane is blackened and it absorbs all incident radiant energy. Radiant energy, having an intensity of 300 W/m2, is incident normally upon the front surfaces of both vanes. What is the radiant power absorbed by the blackened vane?
A. 0.030 W B. 0.040 W C. 0.050 W D. 0.060 W E. 0.090 W
the length of time a star spends in the main sequence stage depends on its
What will be an ideal response?