A proton and an electron are both accelerated to the same final speed. If ?p is the de Broglie wavelength of the proton and ?e is the de Broglie wavelength of the electron, then
A) ?p = ?e. B) ?p > ?e. C) ?p < ?e.
C
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Equal but opposite charges Q are placed on the square plates of an air-filled parallel-plate capacitor. The plates are then pulled apart to twice their original separation, which is small compared to the dimensions of the plates
Which of the following statements about this capacitor are true? (There may be more than one correct choice.) A) The capacitance has doubled. B) The electric field between the plates has increased. C) The energy stored in the capacitor has doubled. D) The energy density in the capacitor has increased. E) The potential difference across the plates has doubled.
Standing Sound Waves: One of the harmonics of a column of air in a tube that is open at one end and closed at the other has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column in this tube?
A. 32 Hz B. 64 Hz C. 88 Hz D. 128 Hz E. 256 Hz
At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to
A. the speed of radio waves. B. the speed of light. C. the speed of gamma rays. D. all of the above. E. only (a) and (b) above.
A wire of a certain length is carrying a current of 2.0 A. It is placed at an angle of 60° with respect to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N, what is the length of the wire?
A) 1.0 m B) 1.2 m C) 1.4 m D) 1.6 m E) 1.8 m