Standing Waves on a String: A string that is 2.0 meters long is fixed at both ends and tightened until the wave speed is 18 m/s. What is the frequency of the standing wave shown in the figure?
A. 27 Hz
B. 54 Hz
C. 81 Hz
D. 110 Hz
Answer: A
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A nonrelativistic electron and a nonrelativistic proton have the same de Broglie wavelength. Which of the following statements about these particles are accurate? (There may be more than one correct choice.)
A) Both particles have the same speed. B) Both particles have the same kinetic energy. C) Both particles have the same momentum. D) The electron has more kinetic energy than the proton. E) The electron has more momentum than the proton.
The absolute temperature of an ideal gas is directly proportional to which of the following?
A. speed B. momentum C. kinetic energy D. mass
Considering only the effect of diffraction, what is the smallest structure resolvable using a 12keV electron microscope?
a. 
b. 
c. 
d. 
Why are there no black dwarfs yet, but in the future they may make up the majority of normal matter in the universe?
What will be an ideal response?