47. a) Imagine that you are conducting an activitywith a laser to create an interferenceÂ
pattern. Use the appropriate equations to predict twoways (other than the wayÂ
described in the following example) to change theinterference pattern in order toÂ
have closer fringes. Explain your predictions.
Here’s an example to get you started:
According to the equation
Δx = Lλ/d ,Â
the distance between the fringes (∆x) is proportionalto the wavelength (sinceÂ
they are both numerators). This means that increasingone will increase the other.Â
Therefore, decreasing the wavelength will decrease thedistance between the fringes.Â
(Hint: You can use the “Thomas Young’s Double-slitExperiment†simulation fromÂ
this lesson to verify yourpredictions.)Â
b) If you were using a hands-on activity to verifyyour predictions and useÂ
measurements to determine the wavelength of the laserbeing used, describe anyÂ
safety precautions you would take and sources of errorthat you might encounter. BeÂ
sure to explain how you might reduce the effects ofthe sources of error.
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