In which spectral sequence are the hottest stars categorized?
a. O stars
b. B stars
c. A stars
d. F stars
e. K stars
a
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A Michelson interferometer is used to measure the thickness of a thin film with light of wavelength 560 nm. If the film has index of refraction 1.39, and thickness 56.7 microns, a change in the interference pattern of how many bright fringes will result from the introduction of the film into the interferometer?
A. 281 B. 141 C. 78 D. 79 E. 280 F. 140
According to Newton's third law, the Voyager probes pulled just as hard on Jupiter as it did on them when they flew past it. Why were they accelerated enough to leave the solar system but Jupiter still is in orbit about the Sun?
What will be an ideal response?
Newton's Law of Gravity would explain why Saturn, so far from the Sun, moves so slowly across the sky
Indicate whether the statement is true or false
Astronomers have used observations from the Hubble Space Telescope to measure the rate at which the universe is expanding, and have estimated the age of the universe from that measured rate. Suppose the expansion turns out to be faster than current measurements indicate. In that case, our new estimate for the age of the universe would be
A) unaffected. B) younger (less time between now and the Big Bang). C) older (more time between now and the Big Bang).