Springs: The graphs shown show the magnitude F of the force exerted by a spring as a function of the distance x the spring has been stretched. For which one of the graphs does the spring obey Hooke's law?
A. Graph a
B. Graph b
C. Graph c
D. Graph d
E. Graph e
Answer: B
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Intensity of Sound: A barking dog delivers about 1.0 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level in decibels at a distance 5.00 m from the dog? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 61 dB B. 63 dB C. 65 dB D. 68 dB
A nitrogen molecule has a diameter of about 0.29 nm. The mean free path of a nitrogen molecule in a tank of dry nitrogen at room temperature and standard pressure is about 0.10 ?m. A tank containing nitrogen at standard temperature and pressure has volume V. If the tank is compressed by means of a piston to 20% of its original volume, what is the mean free path for a nitrogen molecule under the new conditions?
A. 0.089 ?m B. 0.125 ?m C. 0.080 ?m D. 0.112 ?m
The photoelectric effect is explainable assuming
A) that light has a wave nature. B) that light has a particle nature. C) that light has a wave nature and a particle nature. D) that light is an electromagnetic phenomena.
Like the discovery of Uranus, the finding of Neptune was accidental
Indicate whether the statement is true or false