U of MD question of the week
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Silver Member Username: JakeyplaysbassSt. Louis, MO Post Number: 564 Registered: Jul-05 | for my physics class we have to do these questions each week and this weeks has to do with speakers/subs so i thought i would post it to get alot of answers. http://www.physics.umd.edu/lecdem/outreach/QOTW/active/q242.htm |
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Silver Member Username: GoatinU.S.A Post Number: 300 Registered: Jan-06 | I have noo idea.. when you find out ^^bump this thread with the answer I am currious but I am betting on (b). |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 2140 Registered: Mar-04 |
10%+!!!!! wow...thats one h3ll of an efficient speaker! JL 13w6v2's are ~0.33% efficient. oh yea...i bet the answer is it wont move. cause sound it a wave...not a wind. but sound can create a pressuring effect (SPL) (dont quote me on that one  ) |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 11124 Registered: Dec-03 | the flame shouldn't really move, since the air is compressed and rarified throughout the volume of the room the speaker is in, assuming the speaker is in a sealed enclosure or infinite baffle. Now if this were a ported box.. and the speaker were in front of the port it'd be a whole different story. that's my guess. |
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Silver Member Username: RedlinerWilmington, Ma Post Number: 714 Registered: Jun-05 | i was just thinking the same thing marshall but for some reason i dont think that is the answer but I hope it is cause thats what I am going for D my final answer lol |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 2146 Registered: Mar-04 | ^yea...what glass said -thats pretty much what i was thinkin |
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Silver Member Username: Baseball1187Columbia, SC Post Number: 577 Registered: Dec-04 | if I remember correctly, from doing this in physics... the disturbance created will indeed put out the flame. it comes from the relatively significant change in pressure that is characteristic of the longitudinal wave. Using a lower frequency tone furthers this, allowing the change in pressure to be more pronounced for a longer period of time.. if you were to plot pressure vs time, it would look like the sine wave on an interval of whatever frequency is being played. so yes, it will put out the flame... like Glass said... "that's just my guess"... but i think i'm right.. let us know |
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Silver Member Username: Baseball1187Columbia, SC Post Number: 578 Registered: Dec-04 | oh, well perhaps they are assuming the change in ambient pressure wont be significant enough to put the flame out. but it will dance! |
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Silver Member Username: JakeyplaysbassSt. Louis, MO Post Number: 566 Registered: Jul-05 | my subs put the flame out but i think its because of all the air from the ported box. i was actually thinking D as well im hoping my teacher will go somewhat into detail with an answer if so ill make sure to pass it on. |
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Gold Member Username: Mikechec9Http://www.cardomain.c... Post Number: 2139 Registered: May-05 | Easy. C Sound pressure will induce rarefaction, moving the electrons outwards. This, like-wise induces a push also outwards against the flame. The subsequent compression (if wired in phase) will pull the flame in the opposite direction. At 36 Hz, you are looking at wave lengths in excess of 9.5 meters. So the crest and troughs of the wave won't have any effect on the oscillation of a flame that close to the source. The axis/nature of the wave is thus a moot point. The only factor left is the pressure of the air molecules being moved against those of the flame. Hence, C (I'm no gambling man, however) |
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Gold Member Username: Chaunb3400Huntsville, Alabama U.S. Post Number: 5432 Registered: Jul-05 | ^^^Teacher,,Hint,Hint...lol |
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