Which of the following frequencies are higher harmonics of a string with fundamental frequency of 150 Hz?
a)200 Hz
b)300 Hz
c)400 Hz
d)500 Hz
e)600 Hz
1.a
2.b and e
3.a, c, and e
4.d
2
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Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. (c = 3.0 × 108 m/s)
(a) What is the index of refraction of this liquid? (b) What is the frequency of the light in air?
The direction of vibration for an electron and the plane of polarization of the light it emits
A) are the same. B) are at right angles to each other. C) may or may not be at right angles to each other. D) are independent of each other.
When a particle and antiparticle meet, they are said to annihilate each other. What does this mean?
a. They explode into tiny fragments. b. They are destroyed, and turned into an equivalent amount of energy. c. They merge and simply disappear. d. none of the above
A hot piece of iron is thrown into the ocean and its temperature eventually stabilizes. Which of the following statements concerning this process is correct? (There may be more than one correct choice.)
A) The change in the entropy of the iron-ocean system is zero. B) The entropy gained by the iron is equal to the entropy lost by the ocean. C) The entropy lost by the iron is equal to the entropy gained by the ocean. D) The ocean gains more entropy than the iron loses. E) The ocean gains less entropy than the iron loses.