F.5 PHYSICS問題!please help!

2010-01-11 3:43 am
我有一題mc唔太明...

Which of the following obstacles can be used to block all the gamma radiation?

A. Paper
B. 1mm aluminium sheet
C. 25mm lead sheet
D. None of the above

ans : B

點解答案係B??唔係D咩?

please help!!

thanks!!!
更新1:

physics8801 : 我都係咁諗呀!咁係咪個ans錯呢?? thank you

回答 (2)

2010-01-11 4:54 am
✔ 最佳答案
Notice that the question states "..... to block ALL the gamma radiation"
The answer should be option D, as gamma radiation cannot be completely blocked. It can only be shielded.
Option B is clearly not the correct answer.
2010-01-11 4:07 am
維基講:製造鉛磚或鉛衣以防護X-射線及其他放射線。
你會在搜尋器上搜尋「鉛衣」會發現鉛衣會用於有放射性的醫療上。
所以答案係B。

2010-01-12 22:42:28 補充:
這裡有關鉛與x-ray補充。
參考資料後,發現題目沒有清楚定義伽傌射射的量,難以判決。


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