The hydrogen in our solar system was created from subatomic particles in ______
a. the Earth
b. our sun
c. Jupiter
d. the Big Bang
e. supernovas
D
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The Doppler effect is observed when the source and the observer are at rest with respect to each other
Indicate whether the statement is true or false
Convection can occur
A) only in gases. B) only in solids. C) only in liquids. D) only in liquids and gases. E) in solids, liquids, and gases.
In a Young's experiment, the paths from the slits to a point on the screen differ in length, causing destructive interference at the point. Which of the following path differences would cause this destructive interference?
a. 3l/2 c. 5l b. 4l d. None of these choices.
The brightest main-sequence star in a cluster has a surface temperature of 30,000 K and a luminosity of about 104 LSun. Referring to the figure above as needed, what is the approximate age of the cluster?
A) 107 years B) 109 years C) 1011 years D) 1013 years