Tātai Pānga Whakaahua-Hiko
Ko te pānga whakaahua-hiko he āhuatanga e tukuna ai ngā irahiko mai i te mata o tētahi rauemi ina mimiti te rauemi i te mārama, i te irahiko hiko rānei me te nui o te kaha. I kitea tuatahitia tēnei āhuatanga e Heinrich Hertz i te tau 1887, ā, i muri mai ka whakamāramahia e Albert Einstein i te tau 1905, ā, i te mutunga ka toa ia i te Tohu Nobel mō te Ahupūngao i te tau 1921. Ka matapakihia e tēnei tuhinga te whakamāramatanga, ngā mātāpono taketake, ngā tātai, me ngā whakamahinga o te pānga whakaahua-hiko.
Te Mārama ki te Pānga Whakaahua-Hiko
Ko te pānga whakaahua-hiko he āhuatanga ā-tinana e panaia ana ngā irahiko mai i te mata whakarewa ina whakamāramahia te mata e te mārama, e te irahiko hikohiko rānei o tētahi auau motuhake. Ka kiia ēnei irahiko e panaia ana he irahiko whakaahua. Kāore i taea te whakamārama i tēnei pānga e te ariā ngaru matarohia o te mārama, ā, nā reira i whakawhanakehia ai te ariā photon e Albert Einstein. I roto i tana whakamārama, i whakaarohia te mārama he mea hanga mai i ngā matūriki motuhake e kiia nei ko ngā photon.
Ngā Mātāpono Taketake o te Pānga Whakaahua-Hiko
Ko te kaupapa matua o te pānga hikohiko e ahu mai ana i te taunekeneke i waenga i ngā photon me ngā irahiko i roto i tētahi rauemi. He pūngao tō ia photon e rite ana ki tōna auau, ka taea te whakaatu mā te tātai:
\[ E = h \cdot f \]
kāore i te mana:
– Ko te pūngao photon (i roto i ngā Joules, J) ko \( E \),
– Ko te pūmau a Planck te \( h \) (\( 6.626 \times 10^{-34} \) Js),
– Ko te \( f \) te auau o te mārama (i roto i te Hertz, Hz).
Ina pā te pūngao o te photon ki tētahi irahiko i roto i tētahi rauemi, ka taea te whakawhiti i tōna pūngao ki te irahiko. Mena ka nui ake te pūngao o te photon i te mahi mahi (\( \phi \)), arā, te pūngao iti rawa e hiahiatia ana hei tango i tētahi irahiko mai i te mata o te rauemi, ka tangohia te irahiko mai i te mata. Ka whakawhirinaki te mahi mahi ki te momo rauemi, ā, ka whakaaturia i roto i ngā electronvolts (eV).
Tātai Pānga Whakaahua-Hiko
Ka taea te whakaatu i te pūngao nekeneke (\( KE \)) o te irahiko i panaia penei:
\[ KE = h \cdot f – \phi \]
kāore i te mana:
– Ko te pūngao nekeneke o te irahiko (i roto i ngā Joule, J) ko \( KE \),
– Ko te pūngao o te photon e haere mai ana ko \( h \cdot f \),
– Ko te \( \phi \) te mahi a te rauemi.
E whakaatu ana tēnei whārite ko te pūngao nekeneke o ngā irahiko i panaia he rite tonu ki te auau o te māramatanga taunga mai, ā, ka heke iho me te mahi a te rauemi.
Whakamātautau Pānga Whakaahua-Hiko
Ko ngā whakamātautau pānga hikohiko e whakahaerehia ana i te nuinga o te wā mā te whakamahi i tētahi ngongo korehau kua whakauruhia ki tētahi katote me tētahi anote. He mea hanga te katote i tētahi rauemi e aro ana ki te mārama, pērā i te hiium, te pāhare pākawa rānei. Ina whitia te mārama o tētahi auau motuhake ki runga i te katote, ka tukuna ngā irahiko ka neke ki te anote, ka puta he iahiko hiko e taea te ine.
E whakaatu ana ngā hua o te whakamātautau:
1. Kāore he irahiko e tukuna ana mēnā kei raro iho te auau mārama i te auau paepae, ahakoa te kaha o te kaha o te mārama.
2. Ka piki ake te pūngao nekeneke o ngā irahiko i panaia i te pikinga ake o te auau o te mārama.
3. He rite tonu te maha o ngā irahiko e tukuna ana (nō reira ko te iahiko e puta ana) ki te kaha o te mārama, engari mēnā kei runga ake te auau o te mārama i te auau paepae.
Te Hiranga o te Pānga Whakaahua-Hiko
He mea tino nui te kitenga me te whakamārama i te pānga hikohiko i roto i te whanaketanga o te ahupūngao hou nā te mea:
1. Tautoko mō te ariā irahiko o te mārama: Mā te pānga hikohiko ka whakaratohia he taunakitanga whakamātautau mō te tauira irahiko o te mārama, e kī ana ko te mārama he mea tito mai i ngā irahiko me ngā pūngao motuhake.
2. Whakamārama mō te āhua o te matūriki o te mārama: E whakaatu ana te pānga hikohiko kāore te mārama e whanonga hei ngaru anake engari hei matūriki anō hoki, e tautoko ana i te ariā o te takirua ngaru-matūriki.
3. Te whanaketanga hangarau: Ko te pānga hikohiko te pūtake o ngā momo hangarau, pērā i ngā taputapu kimi whakaahua, ngā panera rā, me ngā kāmera matihiko.
Ngā Whakamahinga o te Pānga Whakaahua-Hiko
He whānuitia ngā whakamahinga o te pānga hikohiko i roto i ngā hangarau hou, ko ētahi o ēnei ko:
1. Ngā Pūtau Rā
Ka whakamahia e ngā pūtau rā, ngā panera photovoltaic rānei, te pānga photoelectric hei huri i te hihi o te rā hei pūngao hiko. Ina mimitihia te hihi o te rā e te rauemi semiconductor i roto i te pūtau rā, ka tukuna ngā irahiko, ka hangaia he iahiko hiko. Ko tēnei hangarau tētahi o ngā puna pūngao whakahou tino whai hua.
2. Pūoko Whakaahua
Ka whakamahia e ngā taputapu whakaahua-whakaahua, pērā i ngā photodiode me ngā ngongo whakarea-whakaahua, te pānga whakaahua-hiko hei kimi i te mārama. I roto i ēnei taputapu, ka puta te iahiko i te marama e pā mai ana, ka puta he iahiko e taea te ine. Ka whakamahia ngā taputapu whakaahua-whakaahua i roto i ngā momo mahi, tae atu ki ngā whakawhitiwhitinga whatu, ngā pūoko mārama, me ngā pūnaha haumarutanga.
3. Kāmera Mamati
Ka whakamahia e ngā kāmera matihiko ngā pūoko whakaahua he miriona ngā pūoko whakaahua iti (pika) e whakamahi ana i te pānga hikohiko hei huri i te mārama e tae mai ana ki ngā tohu hiko. Kātahi ka tukatukahia ēnei tohu hei whakaputa i tētahi whakaahua matihiko. Mā tēnei hangarau ka taea te hopu whakaahua taumira teitei me ngā āheinga tukatuka whakaahua matatau.
4. Te Matawai Whakaahua-irahiko
Ko te irahiko whakaahua he tikanga tātari e whakamahi ana i te pānga whakaahua-hiko hei ako i te hanganga matū me te hanganga o ngā rauemi. Mā te whakamātao i tētahi tauira ki ngā hihi-X, ki te mārama ultraviolet rānei, me te ine i te pūngao nekeneke o ngā irahiko kua panaia, ka taea e ngā kaipūtaiao te whiwhi mōhiohio mō te hononga matū me te hanganga hiko o te rauemi.
5. Ngā Whakamahinga i roto i te Ahupūngao Whakamātautau
E whakamahia ana te pānga whakaahua-hiko i roto i ngā whakamātautau ahupūngao maha hei ako i ngā āhuatanga o ngā rauemi me ētahi atu āhuatanga ā-tinana. Hei tauira, i roto i ngā whakamātautau ahupūngao matūriki, ka whakamahia ngā pūoko whakaahua-hiko hei tautuhi i ngā matūriki iti-atomika me te ine i ō rātou pūngao.
Whakamutunga
He āhuatanga nui te pānga hikohiko i roto i te ahupūngao e pā ana ki te pana o ngā irahiko mai i tētahi rauemi ina whakaatuhia ki te mārama he nui te kaha. Nā te whakamārama a Albert Einstein mō te pānga hikohiko i tautoko te ariā matūriki o te mārama, ā, i whakarato taunakitanga mō te āhua matūriki o te mārama. Ko te tātai taketake mō te pānga hikohiko, KE = h ⋅ f – phi, e whakaahua ana i te whanaungatanga i waenga i te kaha photon, te mahi mahi o te rauemi, me te kaha nekeneke o ngā irahiko i panaia.
He maha ngā whakamahinga mahi, pērā i ngā pūtau rā, ngā taputapu whakaahua, ngā kāmera matihiko, me te tirotiro irahiko whakaahua, kua noho te pānga whakaahua hei tūāpapa mō ngā hangarau hou maha. He mea nui te māramatanga hōhonu ki tēnei pānga, ehara i te mea i roto i te ahupūngao ariā anake, engari i roto hoki i te whanaketanga o ngā hangarau ka taea te whakarerekē i te āhua o tō tātou noho me te mahi.
