Arow of seats is parallel to a stage at a distance of 90 m from it. at the center and front of the stage is a diffraction horn loudspeaker. this speaker sends out its sound through an opening that is like a small doorway with a width d of 0.070 m. the speaker is playing a tone that has a frequency of 4.00 x 10 hz. the speed of sound is 343 m/s. what is the separation between two seats, located near the center of the row, at which the tone cannot be heard?

Perhaps seek some professional ? it isn't very asking some children who are just trying to find out answers to homework.also, it seems professional would actually be good to you. obviously it isn't going to magically fix your depression, but it'll do something. drugs, smoking weed, it won't do much, especially if your husband is against it. if you do it he'll dislike it. but talk to him, try and get him to listen to you, and figure everything out together, okay? there's a website- maybe it can offer some ?