Question

For a diffraction horn loudspeaker, sound emerges through a rectangular opening. The opening of a diffraction horn has a width of 0.12 m. If the speaker emits a continuous tone with a wavelength of 0.09 m, at what angle does the first minimum occur

Answer 1

Answer:

48.6 ⁰

Step-by-step explanation:

Data:

Conditions for the first minimum are as follows:

a sinΘ = λ         ...(1)

where a = 0.12 m

           λ = 0.09 m

From condition (1) sin Θ =  λ/a

                                        = 0.09/0.12

                                   Θ  = sin ⁻¹ (0.09/0.12)

                                         = 48.6⁰ Ans