Kamis, 29 April 2010

Wilhelm Conrad Röntgen Sang Penemu Sinar X

Wilhelm Conrad Röntgen (27 Maret 1845 – 10 Februari 1923) ialah fisikawan Jerman yang merupakan penerima pertama Penghargaan Nobel dalam Fisika, pada tahun 1901, untuk penemuannya pada sinar-X, yang menandai dimulainya zaman fisika modern dan merevolusi kedokteran diagnostik.

http://nautilus.fis.uc.pt/wwwfi/figuras/fisicos/img/roentgen.jpg


Rontgen belajar di ETH Zurich dan kemudian guru besar fisika di Universitas Strasbourg (1876-79), Giessen (1879-88), Wurzburg (1888-1900), dan Munich (1900-20). Penelitiannya juga termasuk karya pada elastisitas, gerak pipa rambut pada fluida, panas gas tertentu, konduksi panas pada kristal, penyerapan panas oleh gas, dan piezoelektrisitas.

http://media.isnet.org/iptek/100/Rontgen.gif

http://upload.wikimedia.org/wikipedia/commons/0/0c/Wilhelm_Conrad_R%C3%B6ntgen.jpg

Pada tahun 1895, saat mengadakan percobaan dengan aliran arus listrik dan tabung gelas yang dikosongkan sebagian (tabung sinar katode), Rontgen mengamati bahwa potongan barium platinosianida yang berdekatan melepaskan sinar saat tabung itu dioperasikan. Ia merumuskan teori bahwa saat sinar katode (elektron) menembus dinding gelas tabung, beberapa radiasi yang tak diketahui terbentuk yang melintasi ruangan, menembus bahan kimia, dan menyebabkan fluoresensi. Pengamatan lebih lanjut mengungkapkan bahwa kertas, kayu, dan aluminum, di antara bahan lain, transparan pada bentuk baru radiasi ini.

http://photos.aip.org/history/Thumbnails/rontgen_wilhelm_conrad_f2.jpg

http://www.nlm.nih.gov/visibleproofs/media/detailed/vi_c_201.jpg

Ia menemukan bahwa itu mempengaruhi plat fotografi, dan, sejak tidak secara nyata menunjukkan beberapa sifat cahaya, seperti refleksi atau refraksi, secara salah ia berpikir bahwa sinar itu tak berhubungan pada cahaya. Dalam pandangan pada sifat tak pasti itu, ia menyebut fenomena radiasi X, walau juga dikenal sebagai radiasi Rontgen. Ia mengambil fotografi sinar-X pertama, dari bagian dalam obyek logam dan tulang tangan istrinya.

66 Comments:

HAZEL DIO FEBRIADI said...

Pertamaxx, musti sering-sering datang nih

el_cahya said...

bahan yang digunakan adalah lah gula pasir dengan perbandingan 1 kg gula mampu menghasilkan 30 – 40 kantung harum manis besar dengan harga jual Rp.5000/kantung.

modal untuk 1 kg gula adalah :

1 kg gula Rp. 8.800,-
( harga sewaktu-waktu bisa berubah)
gas elfiji Rp.2000.- ( cuma sedikit)
plastik Rp. 5.000,-
jadi jumlah modal untuk membuat gulali dari 1 kg gula
adalah Rp. 15.800,-
1 kg gula = 35 kantung ( kita ambil tengahnya saja)
dengan harga jual Rp. 5.000,-/kantung
25 X 5.000 = Rp. 125.000,-
jadi ,
125.000 - 15.800 = Rp. 109 .200,-
maka keuntungan yang akan diperoleh dari 1kg gula
adalah Rp. 109.200,-
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sandy said...

harus banyak terima kasih nih sama ni orang..

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Pengobatan asam urat said...

jdi dia ya penemu sinar x itu...

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