Diffraction is least when illumination is with
A) red light.
B) blue light.
C) an electron beam
D) none of the above
Answer: C
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If you were to inhale a few breaths from a helium gas balloon, you would probably experience an amusing change in your voice. You would sound like Donald Duck or Alvin the Chipmunk. What is the cause of this curious high-pitched effect?
A) The helium causes your vocal cords to tighten and vibrate at a higher frequency. B) For a given frequency of vibration of your vocal cords, the wavelength of sound is less in helium than it is in air. C) Your voice box is resonating at the second harmonic, rather than at the fundamental frequency. D) Low frequencies are absorbed in helium gas, leaving the high frequency components, which result in the high, squeaky sound. E) Sound travels faster in helium than in air at a given temperature.
Entropy: When 1.0 kg of steam at 100°C condenses to water at 100°C, what is the change in entropy of the steam? The latent heat of vaporization of water is 22.6 × 105 J/kg.
A. zero B. 6.1 × 103 J/K C. -6.1 × 103 J/K D. 22.6 × 105 J/K E. -22.6 × 105 J/K
The modern view of our place in the universe suggests that life elsewhere may be
A) this view gives us no clue of the likelihood of life elsewhere B) rare C) common D) at the center of another, parallel universe
What is one hypothesis for why the crust in the northern hemisphere of Mars is thinner and lower than that in the southern hemisphere?
A) a giant impact blasted away crust from the northern hemisphere B) it once hosted an ocean of water which eroded away the crust C) tectonic activity caused the southern hemisphere to rise up above the level of the northern hemisphere D) massive "marsquakes" caused the northern hemisphere to subside