The orbits of most asteroids
A) lie beyond Neptune.
B) lie entirely beyond the orbit of Mars.
C) cross the orbit of Mars.
D) cross the orbit of Earth.
E) cross the orbits of all four terrestrial planets.
B
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From hottest to coolest, the seven letters for the star types are ________
Fill in the blank(s) with correct word
The thickness of the photosphere is about 100 times the diameter of the Earth, and large sunspots are larger than our whole planet
Indicate whether the statement is true or false
To make a p-type semiconductor from silicon, one element that might be added as an impurity is ________.
Fill in the blank(s) with the appropriate word(s).
A metal surface has a work function of 2.50 eV. What is the longest wavelength of light that will eject electrons from the surface of this metal?
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)