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K娃糖豆對“物理”知識的感知(2)--有關核反應和Heat

(2014-01-16 08:19:09) 下一個
糖豆4歲時看過一個YouTube clip有關“太陽內的核聚變”。當天晚上幫助他刷牙時,他的倆胖胖小手攤開說:“two Hydrogen are here....”,然後pia一聲拍一起"hit each other!  One Helium is here!” 夠形象!

糖豆5歲了,當他開始對“WWII”發生濃厚興趣時,又牽扯出這些“核能”問題。當我很簡潔的在紙上畫了fission圖:(Uranium被Neutron hit後裂變成另外兩個elements,釋放出3個Neutron!不容易啊!非理科生的糖豆媽被訓練成半個nerd了)。糖豆馬上聲明:I know how to stop this reaction!” 我?他說:“Just remove the neutron or the Uranium!Then the reaction stops!” 我點頭。繼續教他說:“這個chain reaction不僅僅是release two elements和neutrons。。。”沒等我說完,小人又說:“I know! A lot of HEAT!” 然後神秘兮兮地低聲在我耳邊說:“Is that the nuclear Bomb Ka-boom about?”  當然,這個問題後來又牽扯出了gamma ray。。。小人今天後曾問我哪裏可以買到Uranium,被我認認真真地教育了一番。主要是:千萬別在外麵給我瞎說哈!

同一時期,他又想起了Nuclear Fussion。我找紙筆準備畫圖,他已經發問:“Will the temperature reaches fifteen or sixteen million degree (15,000,000 degree)when the Hydrogen bomb explores?” 看我愁眉苦臉狀,他說:“That is the temperature inside the Sun!”我心虛啊!狗的時候咋就沒有仔細看看呢 (BTW,他是對的)。當時,我剛畫完現炒現賣的easy diagram(複雜的我記不住啊!汗!),糖豆抓過我手裏的筆,刷刷地在反應的product裏寫上“Neutron”!嘿!小子咋就蒙對了呢。

最近兩天,糖豆同學正在琢磨Radioactive decay的問題。看了個掃盲片,講啥是alpha,beta和gamma decay的。晚上臨睡給我總結說“Alpha decay is losing two neutrons and two protons;  Beta decay is one neutron turns to proton or proton changes to Neutron: these two are just the same thing with different charge, I think.  Gamma decay is just releasing energy as gamma ray!”我問:“到底什麽是gamma ray啊?”他想也不想地就回答:“Gamma ray is light with a lot of energy!You know,the photon stuff?EM?” 還沒等我回過神來,他問:“Is there any particle change involved in gamma decay?" 我心虛無語。

之所以最近糖豆想到這個問題,也算是給我挑的。過節shopping路上無聊,我問:“Arsenic到底是什麽呀?最近總想起這個詞。”糖豆回答:“It is an element。It is green color and toxic!I think it is number 85.”我立馬問了Siri。小朋友說的特性對了,但將As (Arsenic, 33)和 At (Astatine, 85)給攪混了。被糾正後,他繼續說:“Is number 85 radioactive?I know 84 Polonium and 86 Radon is。You know the 'Radon' might be in our basement?”然後問題就扔過來了:“Mommy,what is ‘radioactive’ anyway!”

再講講小糖豆對Heat的認識吧。

暑假裏午餐簡單。給他弄了根corn dog。看著冒著熱氣的corn dog,糖豆努力地吹氣,想讓它快點兒冷下來。然後,問題就來了:“Mommy!How come browing air can make it cool down faster?”我說:“熱空氣給吹走了呀!”他點頭。啃到一半了,他突然問:“What about the heat from the Sun?There is no air in the Space!How the heat come to Earth!”我不知道啊!老實地承認了。他若有所思地說:“I think the heat might take the ride with Photon to get here!” 他的直覺居然是對的。這就引出了後麵一長串的exploration:EM,String theory,Quantum theory等等。

幾天後的晚上,發現糖豆將腦袋悶在被子裏。我問他為什麽,噱他說:“被子裏臭臭的!用完Oxygen,你可就麻煩了!”他露出大腦袋樂:“I am heating up the air in my 被子!”然後他說:“The oxygen in air is warm; it is gas so it carries more heat than liquid (oxygen)。”他的口吻是“肯定式”的。我等他入睡後還問糖豆爸爸,倆人琢磨:“liquid吸熱才能成gas,貌似有道理哈”。最後還是我去google了,糖豆是正確的:Air molecules carries thermo energy。
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