AL Physic mc
2012-02-14 6:12 am
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1. why sometimes demical place is considered but sometimes significant fig. is considered?
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2. can I use d=(wavelength)/(2tan(theta))?
回答 (2)
2012-02-14 7:11 am
✔ 最佳答案
1. As a general rule, error should be taken to 1 significant figure. The result should be taken to the same place (or decimal place) as the error.Since the error is +/- 0.3 m/s^2, the value of g should be taken to one place after decimal, i.e. same decimal plac as the error. Thus g =9.8 m/s^2
2. How do you get this formula?
The correct forumla is 2d = m入
or d = m入/2
You cannot relate m (which is an integer) by 1/tan(theta)
2012-02-15 8:22 am
Chauchau, you haven't realized that the "d" in your formula represents the separation between two consecutive fringes, but not the thickness of air wedge.
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