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[Phy] wave mc

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wave mc

ans is A

點解呀
我揀D, 有咩問題

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1more

點先知要變R定係V

[ 本帖最後由 game705 於 2010-4-10 10:50 PM 編輯 ]
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Stationary wave is out of the scope.

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原來係咁

仲有題呀,
Q44
我有2個ans key
1個話C, 另一個E

我揀C. 邊個岩
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引用:
原帖由 kiwakwok 於 2010-4-10 10:49 PM 發表
Stationary wave is out of the scope.
咁如果改改題目
係一個正常既wave, 咁我岩唔岩

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回覆 #3 game705 的帖子

It depends on whether you consider the heat gained by the polystyrene cup.

I think you better check the answer given by HKEAA.

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引用:
原帖由 kiwakwok 於 2010-4-10 10:58 PM 發表
It depends on whether you consider the heat gained by the polystyrene cup.

I think you better check the answer given by HKEAA.
我問下fd先

咁第33 題呢

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33.
Use V = IR to filter out some silly answers.
Then think about what will happen when answer E is adopted.

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引用:
原帖由 kiwakwok 於 2010-4-10 11:34 PM 發表
33.
Use V = IR to filter out some silly answers.
Then think about what will happen when answer E is adopted.
如果ans係e 咁會點?

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回覆 #8 FC科學怪人 的帖子

if resistance of the wire is halved, current won't become I_0 indeed.
You can think about the resistance of the appliance

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you also have to consider the resistance of the appliance.
So, even though the total resistance of the connecting wire is halved, the equivalent resistance is not necessarily halved.

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Answer of the question 44 should be C.

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