When a nucleus undergoes alpha decay, the daughter element always has
A. more electrons than the parent.
B. less charge than the parent.
C. more neutrons than the parent.
D. the same atomic number as the parent.
Answer: B
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___________ can be used to determine the galaxy's mass if the galaxy is reasonably close so that the Doppler shift of the galaxy disk material can be measured at several distances from the galaxy's center relative to the center
a. The Hubble constant b. A galaxy's color c. A galaxy's rotation curve d. A galaxy's diameter e. The velocity dispersion method
According to Copernicus, retrograde motion for Venus must occur around
A) greatest elongation, when the planet is farthest from the Sun. B) inferior conjunction, when it passes between us and the Sun. C) superior conjunction, when the planet is on the far side of the Sun. D) quadrature, when the planet is 90 degrees away from the Sun. E) opposition, when the planet lies opposite the Sun in the sky.
The block that displaces the greatest volume of water when submerged is a
A) 1-kg block of aluminum. B) 1-kg block of iron. C) 1-kg block of lead. D) all the same
A star that is twice as hot as another has twice the
A) Celsius temperature. B) Fahrenheit temperature. C) Kelvin temperature. D) all of the above E) none of the above