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

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 diffraction grating for microwaves.A wide parallel beam of microwaves is incident normally on the sheet.If the intensity maxima occur 2.0° apart in the central region,what is the wavelength of the microwaves?

A) 5.0 mm
B) 6.0 mm
C) 7.0 mm
D) 8.0 mm
E) 9.0 mm