موسوعة الاختراعات ( 307 ) دائرة المعارف الذرية 5 ( Photoelectric Effect – Geiger Counter – Atomicdust – Photon )

دائرة المعارف الذرية 5

(Photoelectric Effect – Geiger CounterAtomicdustPhoton )

تحتوي هذه الصورة على سمة alt فارغة; اسم الملف هو Screenshot_2020-04-08-thumb2-water-drops-texture-4k-black-background-water-drops-water-backgrounds-jpg-صورة-JPEG،-710×444-....png

ظاهرة التحول الكهروضوئي ( Photoelectric Effect ) :

ظاهرة اكتشفها العالم الروسي ستوليتوف عام 1872م ،

حيث أخذ دورقاً مفرغاً من الهواء ووضع فيه لوحين معدنيين ، وربطهما ببطارية كهربائية ، وكان طبيعيا ً إلا أنه كان يمر التيار الكهربي ،

لكنه وجه ضوء مصباح زئبقي على أحد اللوحين تولد تيار كهربي في الدائرة الكهربية ،

وعندما أطفأ ضوء المصباح توقف مرور التيار ،

تحتوي هذه الصورة على سمة alt فارغة; اسم الملف هو Screenshot_2020-04-08-thumb2-water-drops-texture-4k-black-background-water-drops-water-backgrounds-jpg-صورة-JPEG،-710×444-....png

فاستنتج من ذلك وجود عوامل ناقلة لتيار الكهرباء في الدورق عرفت فيما بعد باسم الإلكترونات ،

وهي لم تظهر إلا عند توجيه الضوء على اللوح.

وقد عالج أينشتين في عام 1905م ،

هذه الظاهرة وأوضح أن سر التيار الكهربي يعود إلى انطلاق الإلكترونات من المعدن بتأثير الضوء.

تحتوي هذه الصورة على سمة alt فارغة; اسم الملف هو Screenshot_2020-04-08-thumb2-water-drops-texture-4k-black-background-water-drops-water-backgrounds-jpg-صورة-JPEG،-710×444-....png

للمزيد من المعلومات عن ظاهرة التحول الكهروضوئي ( Photoelectric Effect ) :

https://bit.ly/2ZLNbjz

تحتوي هذه الصورة على سمة alt فارغة; اسم الملف هو Screenshot_2020-04-08-thumb2-water-drops-texture-4k-black-background-water-drops-water-backgrounds-jpg-صورة-JPEG،-710×444-....png

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102 ردّ على “موسوعة الاختراعات ( 307 ) دائرة المعارف الذرية 5 ( Photoelectric Effect – Geiger Counter – Atomicdust – Photon )”

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