A black hole may be visible because electromagnetic radiation is emitted from an ________ surrounding it, heated up enough to emit X-rays
Fill in the blank(s) with correct word
accretion disk
You might also like to view...
A white dwarf will radiate its heat into space and become a black dwarf after a few ____
a. thousands of years b. millions of years c. hundreds of millions of years d. billions of years e. hundreds of billions of years
Studying the chromosphere and corona: Consider observations of the solar chromosphere and corona
What are the principle difficulties in observing them in X-ray, ultraviolet, and in visible light? What could be done to circumvent those difficulties?
At 10°C, which is more concentrated—a saturated solution of sodium nitrate, NaNImage, or a saturated solution of sodium chloride? (See figure shown above.)
A) At 20°C a saturated solution of sodium nitrate, NaNImage, is more concentrated than a saturated solution of sodium chloride, NaCl. B) At 10°C a saturated solution of sodium chloride, NaCl, is more concentrated than a saturated solution of sodium nitrate, NaNImage. C) At 10°C a saturated solution of sodium nitrate, NaNImage, is more concentrated than a saturated solution of sodium chloride, NaCl. D) At 25°C a saturated solution of sodium nitrate, NaNImage, is more concentrated than a saturated solution of sodium chloride, NaCl.
What is the relationship between Bohr's model and the characteristic spectral lines of gases?
a. None. Bohr's model does not explain spectral lines. b. The spectral lines are determined by the size of the initial orbit. c. The spectral lines are determined by the various orbital jumps electrons can make. d. The spectral lines are determined by the absorption of photons by the atom. e. The spectral lines are determined by the angles at which electrons are emitted when light hits them.