Plane microwaves are incident on a thin metal sheet that has a long, narrow slit of width 4.8 cm in it. the microwave radiation strikes the sheet at normal incidence. the first diffraction minimum is observed at θ = 42°. what is the wavelength of the microwaves?

Explanation:

given,                                                                            

width of narrow slit = 4.8 cm                                

minimum angle of diffraction = θ = 42°                

wavelength of the microwave = ?                            

condition for the diffraction for single slit diffraction

for the first minima m = 1                          

wavelength of microwave radiation is equal to

the wavelength of microwaves is equal to

i would say the answer is food.

hope this !