A Metallic Sheet Has a Large Number of Parallel Slits,5

question 2

Multiple Choice

A metallic sheet has a large number of parallel slits,5.0 mm wide and 20 cm apart.This sheet is used as a 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

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