If a specially designed space probe reaches the event horizon of a black hole, an observer watching the clock on this probe from a safe distance would see
A) the clock slow down.
B) the clock speed up.
C) the clock keep time in sync with the observer's clock.
D) the time on the clock would appear to change randomly.
A
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The hydrogen Balmer line H? has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the fractional change in wavelength or redshift z of this quasar?
a. 5 b. 0.5 c. 0.25 d. 4 e. 1944.4
Process of Science: Name a testable hypothesis of nebular theory that was shown to be false in observations of extrasolar planets. Must we throw out the theory and start from scratch, i.e
, is the observation completely inconsistent with a nebular formation?
Why don't low-mass stars have the CNO cycle occurring in their cores?
A) They don't have enough carbon, nitrogen, and oxygen. B) The CNO cycle makes elements heavier than carbon, nitrogen, and oxygen. C) Their core temperatures are too low.
What does the prefix micro- stand for?
What will be an ideal response?