Which of the following particles is (are) considered to be elementary?
a. the neutron
b. the meson
c. the electron
d. All of the above.
c
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A parallel-plate vacuum capacitor has an area of 1×10-4m2, a spacing between the plates of 1×10-3 m, and a voltage of 1 V.
(a) Calculate the capacitance of this capacitor. (b) A microcapacitor is replacing the capacitor in part (a). It must have the same capacitance; however, the new area is 1×10-10 m2, and the spacing between the plates is now 1×10-6 m, with 1 V applied. (b1) What is the dielectric constant and dielectric strength required for the material inthe microcapacitor? (b2) Are there any materials available that can meet these requirements, and if so, what are they? (b3) What is the polarization (P) in this microcapacitor, and how does this polarization compare to the surface-charge density if this were a vacuum capacitor?
Lithosphere
What will be an ideal response?
A metal surface has a work function of 2.50 eV. What is the longest wavelength of light that will eject electrons from the surface of this metal?
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
A. straight lines in space that go from one magnetic charge to another. B. straight lines in space that are parallel to the wire. C. straight lines in space that are perpendicular to the wire. D. circles that have their centers on the wire and lie in planes perpendicular to the wire. E. circles that have the wire lying along a diameter of the circle.