A clarinet behaves like a tube closed at one end. If its length is 1.0 m, and the velocity of sound is 344 m/s, what is its fundamental frequency (in Hz)?
a. 264
b. 140
c. 86
d. 440
e. 172
c
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In a photoelectric effect experiment, the frequency of photons bombarding the surface is increased until photoelectrons just start to leave the surface. If this occurs at a frequency of 
what is the work function of the surface?
A. 1.0 eV B. 1.5 eV C. 2.0 eV D. 2.5 eV E. 3.0 eV
How might a nearby neighbor change the shape of this galaxy?
A. It might obliterate all life in that galaxy because of collisions between different planetary systems in the merger of the two galaxies. B. A merger with the neighbor might tighten the spiral arms and lead to a shrinking of the bulge component. C. It might make the disk of the galaxy thinner and the halo rounder. D. Small whirlpools might form in the disk of the spiral and the gas and stars would fall into them, leading to the disappearance of the disk. E. The merger of two spiral galaxies may give rise to an elliptical galaxy.
Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge. What happens?
a. Protons are removed from the rod. c. Electrons are added to the rod. b. The fur is left neutral. d. The fur is also charged negatively.
A monochromatic light source emits a wavelength of 403 nm in air. When passing through a liquid, the wavelength reduces to 363 nm. What is the liquid's index of refraction?
a. 1.23 b. 1.05 c. 1.11 d. 1.90 e. 1.81