A Metallic Sheet Has a Large Number of Slits,5

question 31

Multiple Choice

A metallic sheet has a large number of slits,5.0 mm wide and 20 cm apart,and 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 occurs? (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

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