For Q15. Does it mean when one wave particle is at rest, all other particle must be at rest? When one is moving all other particles are moving? (except the nodes)
For Q16, why can't a convex lens with object distance 5.5cm be used? the image is magnified and the object distance is smaller than the focal length.
Thanks for your help
Please help. One MC about wave and one about lens?
回答 (1)
2017-03-24 10:16 am
✔ 最佳答案
15. Yes.All particles in a stationary wave are moving in phase. If not, then the "crest" (the anti-node) would be moving forward and it is not a stationary wave.
16. I could only say that if you choose option C, the focal length of the convex lens works out to be 12.2 cm, and which is not exactly 12 cm as given in the question.
收錄日期: 2021-04-11 21:33:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170323173212AAaYFvY