A television advertisement claiming that a product is light-years ahead of its time does not make sense because ________
A) light-years can only be used to talk about light
B) it doesn't specify the number of light-years
C) it uses "light-years" to talk about time, but a light-year is a unit of distance
D) a light-year is an astronomically large unit, so a product could not possibly be so advanced
C
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The Himalayan Mountains are rugged, jagged peaks and the Appalachians are smooth and rolling. Why is there a difference?
a. The Himalayas are much older and the rocks have begun breaking off. b. The Himalayas are volcanic mountains and the Appalachians are not. c. The Appalachians are much older and have been smoothed by erosion. d. The Appalachians are younger and just started to be thrust upward by plate tectonics. e. a and d
Which two factors determine a star's luminosity?
A) radius and surface temperature B) radius and distance from Earth C) surface temperature and distance from Earth D) mass and radius E) mass and surface temperature
When we see X-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system
Which one would force us to immediately rule out the possibility of a black hole? A) bright X-ray emission that varies on a time scale of a few hours B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths C) sudden, intense X-ray bursts D) visible and ultraviolet light from the companion star
Is a nation's destiny determined by its demographics?
What will be an ideal response?