Two long straight wires each carry a current of 12 A. One wire lies on the x-axis with its current in the positive x-direction. The other wire lies on the y-axis with its current in the positive y-direction. In the x-y plane, which quadrant (quadrants) has/have points where the magnetic field is zero?
A. I
B. II
C. II and IV
D. I and III
E. none
D. I and III
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Which of the beams is due to a high energy electron?
A) a B) b C) c D) all of the above E) none of the above
Which of these was NOT a difficulty initially met in explaining the photoelectric effect?
a. The transferred kinetic energy seemed to work too quickly. b. If light is a wave, its amplitude should have governed the energy imparted to electrons to cause their emission, and frequency should have had the effects it had. c. Increased intensity of the light did not increase the maximum kinetic energy of emitted electrons. d. Increased frequency of the light increased the maximum kinetic energy of the electrons. e. Electrons could not escape from solid materials.
On average, active galaxies are rare and most are fairly distant from us
Indicate whether the statement is true or false
Explain what types of information can be obtained from a spectral line
What will be an ideal response?