For a diffraction horn loudspeaker,the sound emerges through a rectangular opening.The width of a diffraction horn is 0.14 m.If the speed of sound in air is 343 m/s,at what frequency is the diffraction angle 
equal to 35°?
Definitions:
Effluent Fee
A charge levied on the quantity of pollution discharged into the environment, aiming to control environmental pollution.
Factors Of Production
The resources used in the creation of goods and services, typically categorized into land, labor, capital, and entrepreneurship.
Waste Water
Water that has been used and contaminated, requiring treatment before being released back into the environment.
Profit Maximizing
A method where businesses determine the price and output level that returns the greatest profit.
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