A proton consists of 3 quarks, two with charge +2e/3 and one with charge –e/3 . Of the following, which is closest to the approximate potential energy of the arrangement of the two positive quarks if they are separated by 10–15 m?
a. 1 MeV
c. 1012 MeV
b. 10–19 MeV
d. 100 MeV
A
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Which of the following is an indication that one is dealing with a wave property instead of a particle property?
a. energy b. quanta c. interference d. momentum
A string, 0.28 m long and vibrating in its third harmonic, excites an open pipe that is 0.82 m long into its second overtone resonance. The speed of sound in air is 345 m/s. The speed of transverse waves on the string is closest to
A) 120 m/s. B) 110 m/s. C) 100 m/s. D) 98 m/s. E) 91 m/s.
The switch in the circuit shown in the figure below is closed, and the lightbulb glows steadily. The inductor is a simple air-core solenoid. An iron rod is inserted into the interior of the solenoid, increasing the magnitude of the magnetic field in the solenoid. As the rod is inserted, the brightness of the lightbulb
Wien's Law: The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum? The constant in Wien's law is 0.00290 m ? K.
A. 850 nm B. 907 nm C. 311 nm D. 483 nm E. 502 nm