Diffraction Grating: a Metallic Sheet Has a Large Number of Slits

question 72

Multiple Choice

Diffraction grating: 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. If the microwave wavelength is 6.0 cm, what is the largest angle away from the central maximum at which an intensity maximum occurs.

• A) 64°
• B) 69°
• C) 74°
• D) 79°
• E) 84°

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