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Ayuh Menjadi Photon!

bismillah.

Ni sekadar sesi revision untuk exam A2, dan untuk life. Feel free to indulge in my thoughts *err*

Photoelectric Emission

Eksperimen untuk photoelectric emission ni menggunakan apparatus namanya gold-leaf electroscope.


Dalam electroscope ni, ada daun emas [baca: gold-leaf] yang bercas negatif. Disebabkan kedua-dua daun tu negatively-charged, maka ia repel each other. (Nampak tak daun tu macam tertolak sedikit antara satu dengan yang lain?)

Jadi sekarang ni, eksperimen ni berjalan untuk membuang cas-cas negatif dalam electroscope ni. To do so, satu sinaran dari cahaya boleh nampak [baca: visible light] dipancarkan ke bahagian atas plate electroscope ni.

TAPI, cahaya boleh nampak ni, tak mengeluarkan tenaga yang cukup untuk mengeluarkan cas negatif tu. Sekadar mampu buat cas negatif tu menari-nari sekeliling plate tu je (refer to excited electrons) Bergolek ke sana ke mari, tapi tak mampu untuk keluar dari plate tu.

Jadi, kita masih tak capai matlamat untuk pisahkan dan keluarkan cas negatif tu (electrons) dari metal plate tu.

What to do? What to do?



Alternatifnya, kita gunakan satu lagi sinaran cahaya yang ada wavelength pendek sikit, UV light. Well, UV light ni bunyi je ade wavelength pendek, tapi frequency dia tinggi! Err.. dibandingkan dengan cahaya boleh nampak tu lah. Higher frequency brings about higher energy.

So, bila UV light dipancarkan ke atas metal plate tu, akan keluar satu tenaga berkepala bulat, berekor sedikit namanya PHOTON!


Photon ni, takdelah hebat pun. Sekadar cebisan tenaga dari pancaran sinar UV tadi je. Tapi, sebab dia MAMPU, maka dia dapat tarik electron kat atas plate tu keluar dari surfacenya.

Sebenarnya, cahaya boleh nampak tu pun keluarkan photon. Tapi photon tu lemah dan tak cukup kuat untuk tarik electron tu keluar.

Macam mana photon ni bekerja? Dia tu kecik aje!

Haa.. photon ni, dia akan excite electron hasil tenaga yang ada dalam diri dia, sama macam kalau dengan cahaya boleh nampak tadi tu. Tapi, bezanya UV light dengan cahaya boleh nampak ni, ialah kekuatan photon (duh, kan dah cakap tadi? )

Photon ni akan grab hold electron tu, peluk dia kuat-kuat dan bawak electron tu bersama dia. Jadi, terlepaslah electron tu dari ikatan negative charge kat plate tu. Bebas tapi masih dipegang erat oleh photon.

Saat electron tu keluar dari metal plate tu, maka berkuranglah bilangan cas negatif kat dalam electroscope tu. Dan daun emas tu akan tertutup rapat sikit, sebab dah tak banyak cas negatif untuk cause repulsion between the leaves.

Jadi... fenomena inilah yang dinamakan 'Photoelectric Emission'

.E'eh. Makcik ni banyak membebel pulak.

Comel, bila kita pandang dari sudut sisi Islam. Kita sebagai da'ie, kalau kita lemah, mesti kita tak mampu untuk tarik orang lain untuk keluar dari kepompong jahiliyyah dia. Kalau kita lemah, jadilah kita seperti photon yang bersumberkan cahaya boleh nampak tu.

Ada tenaga, tapi tak mampu buat apa-apa.

So, kita perlu gather enough energy, so that kita jadi cukup powerful untuk bawak orang lari. Lari dari jahiliyyah dan perbuatan silam yang tak berfaedah.

Dan sebagai photon, ia tak tinggalkan electron tu bila ia keluar dari plate tu. Samalah macam da'ie. Tak bolehlah kita bekerja hanya untuk keluarkan orang dari jahiliyyah dan biarkan dia cari jalan dia sendiri.

NO!

Kita kena pimpin dia, dan jadikan dia bermanfaat dan mampu membuahkan hasil kerja untuk Allah. Sebab photoelectric emission ni, akan keluarkan tenaga berbentuk electronVolt.

Cuba tengok haa photon tu teramatlah kecik. This proves that size does NOT matter to make a change.

Jadi, kita?

Ayuhlah menjadi photon! Bekerja mengumpul tenaga untuk manusia lain. Kerana hidup ini bukan hanya ada kita, dan syurga nanti bukan hanya ada kita.


#adik-adik faham ke makcik bebel apa ni?



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