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Alt 24.10.09, 18:50   Yukarı Git #1
apeiron
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Standart Sesin Madde İle Etkileşimi


Ses kaynağından çıkan ses dalgaları bir engele çarptığında yani madde ile karşılaştığında ışıkta olduğu gibi maddeden yansıyabilir, madde tarafından soğrulabilir veya maddeden geçebilir.

Sesin Yansıması :
Ses kaynağından çıkan ses dalgalarının bir yüzeye çarpıp geldiği ortama geri dönmesine sesin yansıması denir. Seste ışık gibi yansıma özelliğine sahiptir. Sesin yansıması için kullanılan yüzeyin ışıkta olduğu gibi düzgün ve pürüzsüz olması gerekir. Fakat yansımanın olabilmesi için yüzeyin parlak olmasına gerek yoktur.
Sesin yansıması olayında, ışığın yansıması olayında olduğu gibi yansıma kanunları geçerlidir. (Yani yansıtıcı yüzeye gelen ses dalgası, yüzeyin normali ile eşit açı yapacak şekilde yansır. Yansıma olayında daima gelme açısı yansıma açısına eşittir).
Yansıma olayında ses kaynağından çıkan ses dalgalarının çarptığı yüzeyin düzgün veya pürüzlü olması, yüzeyden yansıyan ses dalgasının miktarını değiştirmez. Yüzey düzgün ve pürüzsüz ise yansıma düzgün olacağı için ses dalgaları aynı doğrultuya gönderilir ve o doğrultuda ses şiddeti artar ve ses daha net duyulur. Yüzey pürüzlü ise yansıma dağınık olacağı için ses dalgaları farklı doğrultulara gönderilir ve (bir doğrultudaki örneğin kulak doğrultusundaki) ses şiddeti azalır.
(Yansıtıcı yüzey olarak düzgün ve pürüzsüz yüzey kullanıldığında sesin daha net duyulmasının nedeni, sesin o yüzeyde düzgün yansımaya uğramasıdır).

NOT :
1- Metrodaki trenin sesinin uzaktan duyulması sesin yansıması ile ilgilidir. Trenin sesi trenden daha hızlıdır ve trenin sesi metronun duvarlarından yansımıştır.
2- Sınıfta iken koridordaki ses dalgaları havada ilerlerken koridorun duvarlarına çarpar. Bu ses dalgalarının bir kısmı duvara girer ve onun içinde yol alır. Duvarda ilerleyen ses, duvardan çıkar ve tekrar sınıftaki havada ilerleyerek kulağa gelir. Duvar sesin bir kısmını soğurduğu için sesin şiddeti sınıf içerisinde azalır.
3- Koridorda bağıran bir kişinin sesinin hem kendisi doğrudan hem de duvarlarda yansıması yayılır.
4- Boş odada çıkarılan ses şiddetlenmiş olarak duyulur. Şiddetli duyulan sesler, odaya eşya yerleştirildiğinde aynı şiddetle duyulmaz. Çünkü boş odada ses dalgalarının bir kısmı odanın duvarlarına çarpar ve tekrar odanın içindeki havada yansır. Bu yansıma tıpkı bir lastik topun duvara çarpıp geri dönmesi gibidir.
5- Yansıma olayında kullanılan yansıtıcı yüzey konumu değiştirilerek;
? Ses istenilen yöne yönlendirilebilir.
? Sesin daha uzaktan duyulması sağlanabilir.
? Sesin yansıma yönü değiştirilince duyulma mesafesi değiştirilir.
6- Banyo gibi bölümlerde yansıtma özelliği fazla olan malzemeler kullanıldığı için ses daha fazla yansır.
7- Spor salonlarında ses yansıması fazla olur. Salondaki sert ve düz yüzey ses enerjisinin büyük bir kısmını yansıtır.
8- Ses 340 m/sn hızla yayılır. Bir binanın önünde oluşan sesin binanın arkasında duyulmasının nedeni, sesin yan binalardan yansımasıdır.
9- Sesin yayılma özelliğinden yararlanılarak okyanusların derinliği ölçülebilir.
10- Tahta, üzerine düşen ses dalgalarının tam***** yakınını yansıtabilme özelliğine sahiptir.
b) Sesin Soğrulması :
Ses kaynağından çıkan ses dalgalarının, çarptığı yüzey tarafından tutulmasına soğurulma denir.
Maddelerin sesi soğurma özellikleri farklıdır. Sert ve düzgün yüzeyli katı cisimlerin sesi soğurma özelliği olmayıp bu cisimler sesi yansıtırlar. Yumuşak ve pürüzlü yüzeyler sesi daha fazla soğurabilirler.
Ses kaynağından çıkan ses dalgaları bir engele çarptığında bir kısmı soğrulduğu için yüzeyin diğer tarafına iletilen ses dalgalarının şiddeti azalır.



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