An EM wave with a wavelength of 500 nm will be visible
a. True
b. False
Indicate whether the statement is true or false
True
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A main-sequence star of 8.5 solar masses can become a white dwarf by
a. exceeding the Chandrasekhar limit. b. losing mass in a close binary. c. gaining mass. d. remaining at 8.5 solar masses.
An object in the sky brightens suddenly, but shows no hydrogen lines in its spectrum. It is most likely a(n):
A) comet. B) type I supernova. C) type II supernova. D) asteroid impact. E) stellar collision.
Chapter 1 contains a quotation by author Norman Mailer from his book Of a Fire on the Moon. Mailer's point is that
A) quantum theory shows that the universe is infinitely deep and subtle. B) physics professors are a bunch of crackpots. C) with the help of science and technology, we are solving most of the world's social problems. D) science is leading us toward a greater understanding of the important truths in life. E) science and technology give us power over nature but our culture we don't know how to use that power.
Why would Earth's orbit be unaffected were the Sun to suddenly become a black hole (with no change in its mass)?
What will be an ideal response?