Single-Slit Diffraction: A beam of light of wavelength 610 nm passes through a slit that is 1.90 µm wide. At what the angle away from the centerline does the first dark fringe occur?
A. 9.35°
B. 11.4°
C. 12.2°
D. 39.9°
E. 18.7°
Answer: E
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Compound Microscope: Which one of the following statements is correct?
A. The image formed by the objective of a microscope is smaller than the object. B. The image formed by the objective lens of a telescope is larger than the object. C. The image formed by the eyepiece is real for both a microscope and a telescope. D. The image formed by the objective lens of a microscope is larger than the object.
Resistors in Combination: Each of the resistors shown in the figure has a resistance of 180.0 ?. What is the equivalent resistance between points a and b of this combination?
A. 450.0 ? B. 720.0 ? C. 540.0 ? D. 180.0 ?
Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
a. 0 b. 1 N/C c. 2 N/C d. 4 N/C e. More information is needed to find the resulting field magnitude at this position.
Robert Koch's contribution was
What will be an ideal response?