Beneficial info on waves Doppler

April 29th, 2010
waves-bundle Beneficial info on waves Doppler

Excellent recording – I use it in my massage practice every day. My clients love it and several have purchased it from here :-)


Help to solve problem about sound waves and the doppler effect?
A jet is flying horizontally from A to B. When the plane is directly overhead at B, a person on the ground (C) hears the sound coming from A. ABC is a right triangle in B. The angle BCA = 36 degrees.The average temperature is 20 degrees Celsius. If the speed of the plane at A is 170 m/s, what is the speed at B, assuming that it has constant acceleration?- Relevant equationsf=1/T f: frequency; T: periodv= waves Doppler λ*f = λ/T λ: wavelengthf(observer)= f(plane)*((v+v[sub]o[/sub])/(v+v[sub]p[/sub])) v=343m/s- The attempt at a solutionFirst off I don't see what steps to take to come up with the answer. There must some implicit data to take into consideration but I can't figure it out.What I assume, since there is a right triangle with an angle given, is that one distance has to be found (AC) to find AB with sin.I found the acceleration by taking t=1second. I know that the sound travels at 343m/s on AC and the speed the plane has after one second on AB is found by calculating v[sub]plane[/sub]= sin(36)*343= 201.6m/s so the acceleration is a= (201.6-170)/1s= 31.6m/s[sup]2[/sup]I can't figure out how to get the distance from A to C or A to B.PS: those values are given from my homework given by the teacher, on the book the same problem has 164m/s for the speed of the plane at A, same angle. The answer for the speed at B is 239m/s
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waves Doppler
waves-bundle Beneficial info on waves Doppler

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15 Responses to “Beneficial info on waves Doppler”

  1. Netty Says:

    The sounds really make a difference with me, I sleep better, with fewer times waking up……….Worth the money!

  2. Ireland Says:

    For me Nature sounds are very relaxing and the most beautiful sounds in this world

  3. Hays Says:

    I was very happy tho find this album, the sound has very high quality, very clear and crisp,I love Nature sounds,specially the sound of the ocean, great buy.Perfect tool when I need to calm down after a long day of work. Highly recommended.

  4. Jenette Says:

    I was hoping that this CD would contain the sounds of soft ocean waves that would lull me to sleep. Instead, the waves are of the crashing-surf variety, and not really that sleep inducing. I suffer from insomnia and was advised that the sound of waves is a good way to ease you off to sleep, so was hoping this CD would deliver that. You have to keep the CD at a very low volume or you will feel you are in the middle of a communal toilet facility with all the whoooshing sounds going on. I wouldn’t have bought this item if I knew had this sort of sound on it. Still, I have been sleeping OK, so maybe it has a hidden rythymn in it that has initially been lost on me.

  5. Ladd Says:

    Quick delivery. Quality product. Very soothing background sounds. Highly recommended. I am a very satisfied customer.

  6. Landsperger Says:

    It is hard to find nature sounds without music in the background. this is strictly ocean waves, just what i was looking for.

  7. Fullerton Says:

    I love this album, I mean, really love it. Bon Iver had my 2009 album of the year selection, and this one could of been my 2010 selection, if it did one thing….. They should of never put the poppy “Good Morning” song on the album. Its like they stole it from some 16 year old disney sponsered singer or band. The rest of the album is pure money though. If you blended The Ocean Blue, Hoodoo Gurus, Death Cab, and a bit of R.E.M together, this album is what you get. Its to bad about that darn song though…

  8. Ketman Says:

    My favorite Rogue Wave album is their first, the organic, acoustic guitar driven, and somehow psychedelic “Out of the Shadow.” “Permalight” is the furthest thing from that, but a logical progression through their discography. It is very “Poppy” with much more blissful melodies and electronic infusions. In fact, 3 or 4 songs on this album use a drum machine in the band’s effort to make nearly danceable rock music.

    I must admit that I prefer the organic sound of their first album, but “Permalight” is probably their best album since for many of the same reasons. It still presses all of the same emotional buttons for me, and the studio ear candy abounds. So many little pieces seamlessly come together to make each track, that the album is fresh and even improves with a half dozen listens.

    One of my friends, a true indie rocker, can’t get over the electronic and poppy sound. I can appreciate that, but this album has all the chops and quality of Rogue Wave at their best. If you’re a fan or an interested newcomer who can deal with a shiny-sweet tune, give this one a listen.

  9. Jonas Says:

    I’m new to Rogue Wave, so I don’t have the perspective of the long time fans. All I can say is, it’s the best pop music of 2010 I’ve heard so far. It reminds me of the pleasantly catchy pop you heard on alternative radio in the mid-late ’90s: Think Foo Fighters’ “Big Me” (“It’s you…I fell into”) and Oasis’ “Wonderwall”. I hear a lot of Elliott Smith here too. Now I loved XO and Either/Or just as much as Roman Candle and Elliott Smith, so maybe you can compare that to new vs. old Rogue Wave as well.

    Also, I commend Rogue Wave for putting the two best tracks at the beginning of the album. I prefer to get hooked in first, which keeps me happy while the rest of the album grows on me.

    This is not groundbreaking music. If “retro” can apply to the sound of 1995-1999 music now, that’s what this is. I for one love it.

  10. Nitinthorn Says:

    Rogue Wave is one of the few bands around today that you really can’t compare to anyone else. I know people toss around names like The Shins or Death Cab, but really Rogue Wave just sounds like Rogue Wave – and to me that’s a very good thing. It’s a tribute to the band’s ability to create songs that are sonically varied and adventurous, and to their desire to grow and evolve from record to record. I’ve always been a firm believer in allowing bands the space and freedom to stretch and experiment. I don’t understand why so many people seem to want their favorite bands to make the same record over and over again. “Permalight” is definitely a departure from “Vultures” and “Asleep at Heaven’s Gate,” but you can still find bits and pieces of the band’s past scattered across the songs. Granted, tunes like “Goodnight” and the title cut are not going to be to everyone’s taste, but after several close listens I found plenty to like about them – and for those who want their old beloved Rogue Wave there are great songs like “The Fear Itself,” which would be right at home on any of the band’s previous records. I give Zach credit for coming through difficult personal times with a bright outlook and a willingness to push himself and his band forward. It’s called personal and professional growth, people, and it’s the only thing that keeps an artist both relevant and interesting. Rock on, Rogue Wave!

  11. Irvin Says:

    This is a beautiful and calming blend of rain, ocean waves and distant thunder. I turn it on in my office (next to my bedroom) to block out the noise from the streets of lower Manhattan. It works beautifully! And such a lovely blend of sounds. Highly recommended. And cheap!

  12. Dickey Says:

    Very nice mellow sounds. Helped baby block out the noise from the next room and helped me sleep next to a loud “grunter” of a baby.

  13. Hooker Says:

    Sound is nice but mine only plays for about 20 minutes also. That’s all that I needed it to play for; but I still feel gypped and misled.

  14. Ehrenberg Says:

    Like others, I found that this track plays for 20:08, not the advertised “78 minutes.” The quality of the recording is good; it features only the sound of waves without new age background music, electronic bird screeches, or fog horn noise.

  15. Haines Says:

    I had the same problem as others but I thought 20 minutes of ocean sounds for 99 cents was still a good deal. I thought I could burn the cd and just hit repeat. Unfortunately the ocean sounds stop after 20 minutes and you are left with 80 minutes of dead air before the cd ends and starts over.

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