LDRs, LEDs and nationalists / LDRler, LEDler ve ulkuculer

Gecen persembe ve cuma okuldan eve geldigimde saat 21.30 civariydi! A Level fizik coursework'larla (yillik odev gibi bir sey) ugrasiyordum. Neredeyse 2 aydir cocuklar adam gibi bir odev cikartabilsin diye debeleniyorum. Ama yine son ana biraktilar ve ben de duzeltmeler vb. ile ugrasirken gec saatlere kadar okulda kalmak zorundaydim. 16 yasindaki bir cocugun excel kullanarak ortalam hesaplayamamasi ne kotu... David cok guzel bir konuda calisti. Gerci konuyu ben tavsiye etmistim. LDR'in (Ligth Dependent Resistor) [Isiga Duyarli Resistans diye cevirecegim ama belki turkcede standard baska bir adi vardir] farkli frekanstaki gorunur isiga nasil tepki verecegini inceledi. Beyaz, yesil, mavi ve kirmizi LED'lerimiz (light Emitting Diode) [buna ne demeli simdi? Isik veren diyot - he he LED demiyorlar mi buna turkcede de... neyse] vardi. Uzerlerindeki voltaj ve gecen akimi ayarlayip hepsinin parlakligini esit tutmaya calistik. Yani 4 LED'de de tek degisen isigin frekansi oldu. LDR, bekledigim gibi farkli resistans degerleri verdi. Ama ilginc olan en yuksek resistance mavi isikta cikti (David bu noktadan sonra yapacagim yorumlari yapamadi malesef, neyse ben yazayim). Oysa ki mavi isigin fotonlarinin tasidigi enerji digerlerine gore daha fazla. Toplam tasinan enerjinin ayni oldugunu dusunursek (parlaklik ayni, voltaj ve akim carpimi ayni deger) mavi isigin saniyede daha az foton tasidigi sonucuna varabiliriz. Dolayisiyla LDR'da degisimi gerceklestiren unsurun uzerine dusen isigin toplam gucu degil getirdigi foton sayisi oldugu sonucuna variyorum ben. Bildigim kadariyla LDR, uzerine dusen isiktan gelen enerjiyle daha fazla serbest elektron sahibi oluyor ve daha kolay iletioyr, dolayisiyla direnci dusuyor. LDR'in calisma presibiyle ilgili biraz daha arastirma geregi duydum. Ilginc sonuclarda yani kisaca. Az foton, yuksek direnc, hmmm. Cok zevkli bir deneydi. Dahasi, soyle de guzel bir sey cikti: Beyaz isik sonucu olusan direnc, mavi, kirmizi ve yesil isik sonucu olusan direnclerin ortalamasina cok yakindi! Ne guzel ya...

Eee simdi ben bunlari yazdim da acaba kac kisi ne sacmaliyor bu dedi, kac kisi de evet yaa ne hos dedi. Iste ben "evet ne guzel" diyebilecek insanlarin sayisinin artisina adadim mesleki hayatimda kendimi; fizik ogretmenligi.

Cok doluyum gunlerdir. Marmara universitesinde ulkuculer bazi ogrencileri cok agir bir sekilde dovmusler :( Videosunu izledim internette. 2-3 gun etkisinde kaldim. Oldum olasi haz etmedim ulkuculerden. Beni taniyan ulkuculer de benden haz etmedi zaten. Insan denilen varligin ne kadar guzel bir butunluk oldugunu gorebilen biri nasil bir baskasini dovebilir ki? Milliyetciligi hic bir zaman ise yarayan bir dusunce bicimi olarak kabul edemedim. Niye benim milliyetim diger milliyetlerden ustun olsun ki? Kultur vb. bircok farklilik neden sadece farklilik olarak kalamasin ve ustunluk yarisinda kullanilsin? O kurtleri dovduk diye ne cok ovunmusunuzdur siz simdi sevgili ulkucu yaratiklar. Oldurmediginize pisman bile olursunuz.


Soylecek cok sey var aslinda. Ama o kadar zaman yok. MST 209 odevime donmem gerekiyor. Pazartesiye bitirmis olmaliyim. Persembe gunu bir okula mulakata gidiyorum, bakalim. Okul hakkinda bir iki cekincem var, gidince sanirim biraz daha netlesir kafam.

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It was about 2130 on last Thursday and Friday when I arrived at home! I was trying to sort out my A-Level students' physics coursework. I have been trying to get a decent piece of work from all my A-level students since about 2 months. Sure, they left it to the last minute and I was trying my best to help them for a good mark. I find it difficult to believe that they hadn't done any power point presentation before and they didn't know how to use excel basic functions such as average... David was working on a really interesting project. How LDR behaves under different frequency visible light. We had red, green, blue and white LEDs. We adjusted voltage and current on each LED so that their power was same when they created different coloured light, shining on the LDR. The only changing variable was the frequency of the light. As we expected, LDR behaved differently. The highest resistance was observed under the blue LED! David, unfortunately, was unable to comment on it. Here my comment follows. Each photon in blue light carries higher amount of energy because their frequency is higher. Since the power was same in all LEDs, I can conclude that blue light had fewer amount of photons that red light had. So, is it the number of photons hitting on the LDR that makes a difference? I need to learn more about how LDR works. Another nice thing was, the white light created a resistance value which was close to the average of resistances created by blue, red and green LEDs. Cool...

Well; I have just mentioned something that really makes me excited. I wonder how many of you said what the heck he is talking about and how many of you said cool. I have dedicated my professional life to increase the number of people who could say cool; teaching physics.

I have lot to say nowadays. In Istanbul, at Marmara University, Turkish nationalists attacked some students and beat them heavily. I saw the news coverage on the internet. I have never liked nationalists; they who know me never liked me. How can one who could see the beauty in the human being beat another one? I have never been able to accept nationalism as a useful way of thinking. Not only Turkey but many other countries have been suffering from nationalism. Why can't we accept all the differences, including the nationality, as a difference only which enriches the life? Why should my nation be better than others? Why is this superiority and inferiority race? Lots to say but no time again.

I got to go back to my MST 209 homework. Should be finished by Monday. On Thursday I have an interview. I have some reservations about the school but I hope to clear them up when visit.