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問PHY 2007 CE MC Q.38 & 2008 CE MC Q.37 +Q40 可唔可以解釋下個答案點黎? THANKS 更新: Q40 唔洗答
最佳解答:
07 Q.38 : figure (b) 同(a)比較, at t=0, particle I 係equibrium position =>displacement=0 , 因此,答案一定不是A.同B. A同I都係rarefraction,E 係compression..... 跟住這些資料黎畫一個s-t graph of 所以particles..... 由於wave係向右邊行, 所以,I is accerating downwards, 因此答案係C 2009-04-16 11:58:13 補充： 08 Q.37 : 首先,留意題目的[after half a period], 再用figure(a)同(b)黎比較 =>發現particles a,e同i 都無行過, 再睇, 發現a同i都係compression,而e係rarefraction, 所以,[after half a period],a同i都應該係rarefraction,而e應該係compression, 係A,B,C,D入面,只有C係 a,e同i 都無行過,而係它們附近的particles則進行了rarefraction,compression....... 因此,答案係C
其他解答:
07 #38 At t=0, particle I starts at equilibrium position. 所以s-t graph一定在零開始----- A,B wrong At=0. centre of compression is E. 因wave travels from left to right, particle I 向左行. 向左是-ve, so, 個graph趺咗先上番去. 08 #37 一粒particle點move?? 1.start at equilibrium position(T=0) 2.move up to crest(T=1/4) 3.move down back to equilibrium position(T=2/4) 4.move down to trough(T=3/4) 5.move up back to equilibrium position(T=1) That's 1 period!!! 所以半個period後, particles a,e,i會返回equilibrium position. Ans 只得C是particles a,e,i返回equilibrium position
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phy longitudinal wave (ce)發問:
問PHY 2007 CE MC Q.38 & 2008 CE MC Q.37 +Q40 可唔可以解釋下個答案點黎? THANKS 更新: Q40 唔洗答
最佳解答:
07 Q.38 : figure (b) 同(a)比較, at t=0, particle I 係equibrium position =>displacement=0 , 因此,答案一定不是A.同B. A同I都係rarefraction,E 係compression..... 跟住這些資料黎畫一個s-t graph of 所以particles..... 由於wave係向右邊行, 所以,I is accerating downwards, 因此答案係C 2009-04-16 11:58:13 補充： 08 Q.37 : 首先,留意題目的[after half a period], 再用figure(a)同(b)黎比較 =>發現particles a,e同i 都無行過, 再睇, 發現a同i都係compression,而e係rarefraction, 所以,[after half a period],a同i都應該係rarefraction,而e應該係compression, 係A,B,C,D入面,只有C係 a,e同i 都無行過,而係它們附近的particles則進行了rarefraction,compression....... 因此,答案係C
其他解答:
07 #38 At t=0, particle I starts at equilibrium position. 所以s-t graph一定在零開始----- A,B wrong At=0. centre of compression is E. 因wave travels from left to right, particle I 向左行. 向左是-ve, so, 個graph趺咗先上番去. 08 #37 一粒particle點move?? 1.start at equilibrium position(T=0) 2.move up to crest(T=1/4) 3.move down back to equilibrium position(T=2/4) 4.move down to trough(T=3/4) 5.move up back to equilibrium position(T=1) That's 1 period!!! 所以半個period後, particles a,e,i會返回equilibrium position. Ans 只得C是particles a,e,i返回equilibrium position
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