Which of the following statements best describes how the uncertainty principle affects conservation of energy?
A) The uncertainty principle allows very short time-scale violation of energy conservation, but energy must still be conserved on time scales that allow measurement.
B) The uncertainty principle invalidated the law of conservation of energy, and as a result, this law is no longer useful to physicists.
C) The uncertainty principle does not apply to energy, so conservation of energy is not affected by it.
D) The uncertainty principle tells us that the law of conservation of energy applies only to very large objects, not to atoms or molecules.
A) The uncertainty principle allows very short time-scale violation of energy conservation, but energy must still be conserved on time scales that allow measurement.
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Organic molecules, including the molecules of life, have at least one functional group. What is a functional group? How do functional groups affect the properties of molecules?
What will be an ideal response?
Two-Source Interference of Sound: A person stands between two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What type of interference does the person perceive?
A. constructive B. destructive C. both constructive and destructive D. neither constructive nor destructive
An object moving along the x axis is acted upon by a force Fx that varies with position as shown. How much work is done by this force as the object moves from x = 2 m to x = 8 m?
?
?
a.
?10 J
b.
+10 J
c.
+30 J
d.
?30 J
e.
+40 J
Which of the following statements is true of fusion reactions in stars?
A) They only occur outside the atomic nuclei. B) They occur only when nuclei of two atoms get very close to each other. C) They only occur as endothermic reactions. D) They only occur when the Coulomb force is zero and there is no Coulomb barrier.