A magnetic field is created by an electric charge if the charge is
a. positive.
b. negative.
c. moving.
d. stationary.
e. any of the above.
c
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According to Wein's law, the higher the surface temperature of a star, the redder its color
Indicate whether the statement is true or false
A compound microscope is made with an objective lens (
= 0.90 cm) and an eyepiece (
= 1.1 cm). The lenses are separated by a distance of 10 cm. If an object is 1.0 cm in front of the objective lens, where will the final image of the eyepiece be located?
A. ?30 B. ?15 C. ?23 D. ?11 E. ?9
Erwin Schrodinger
A) suggested the existence of matter waves (1924). B) discovered the positron using a cloud chamber (1932). C) was the first to produce diffraction patterns of electrons in crystals (1927). D) developed a wave equation for matter waves (1926). E) set the limits on the probability of measurement accuracy (1927).
A cylindrical metal wire at room temperature is carrying electric current between its ends. One end is at potential VA = 50 V, and the other end is at potential VB = 0 V. Rank the following actions in terms of the change that each one separately would produce in the current from the greatest increase to the greatest decrease. In your ranking, note any cases of equality
(a) Make VA = 150 V with VB = 0 V. (b) Adjust VA to triple the power with which the wire converts electrically transmitted energy into internal energy. (c) Double the radius of the wire. (d) Double the length of the wire. (e) Double the Celsius temperature of the wire.
1.b > c > a > e > d 2.d > a > c > b > e 3.c > a > b> e > d 4.a > c > d > e > b 5.None of these.