If one lawn mower causes an 80 dB sound level at a point nearby, four lawnmowers together would cause a sound level of ____________ at that point
a. 92 dB c. 86 dB
b. 84 dB d. none of the above
C
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Massive stars cannot generate energy through iron fusion because
a. iron fusion requires very high density. b. stars contain very little iron. c. no star can get hot enough for iron fusion. d. both fusion or fission of iron nuclei absorb energy e. massive stars supernova before they create an iron core.
At what temperature would the root-mean-square speed (thermal speed) of oxygen molecules be 13.0 m/s? Assume that oxygen approximates an ideal gas. The mass of one O2 molecule is 5.312 × 10-26 kg. The Boltzmann constant is 1.38 × 10-23 J/K
A) 0.217 K B) 1800 K C) 5410 K D) 0.0666 K
Six trillion miles is equivalent in distance to one ______________
a. light-year b. astronomical unit c. parsec d. billion meters
If the speed of an electron increases, its de Broglie wavelength
a. increases c. stays the same b. decreases d. may increase or decrease