If a planet has 3 times the radius of the Earth, but has the same density as the Earth, what is the gravitational acceleration at the surface of the planet? (g = 9.80 m/s2)
a. 29.4 m/s2
b. 88.2 m/s2
c. 265 m/s2
d. 3.27 m/s2
a
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Diagram 6-2 illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an absorption spectrum?
a.
1
b.
2
c.
3
d.
2 and 3
e.
none of them
Mass on a Spring: A 1.15-kg beaker (including its contents) is placed on a vertical spring scale. When the system is sent into vertical vibrations, it obeys the equation y = (2.3 cm)cos(17.4 s-1 t). What is the force constant (spring constant) of the spring scale, assuming it to be ideal?
Fill in the blank(s) with the appropriate word(s).
Spectra of stars often show narrow absorption lines from interstellar matter. What type of interstellar matter produces these?
A) dust B) neutral gas C) ionized gas D) molecules E) All of the above.
The conductivity of a semiconductor sharply increases when 400 nm (or shorter) wavelength light is shone upon it. This is consistent with what energy gap for this material?
A) 3.6 eV B) 0.45 eV C) 2.0 eV D) 3.1 eV E) 1.0 eV