Diffraction Gratings: A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. What is the smallest microwave frequency for which only the central maximum will occur? (c = 3.00 × 108 m/s)
A. 0.50 GHz
B. 0.70 GHz
C. 1.0 GHz
D. 1.5 GHz
E. 2.0 GHz
Answer: D
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