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Your friend has been given a laser for her birthday. Unfortunately, she did not receive a manual with it and so she doesn’t know the wavelen
Question
Your friend has been given a laser for her birthday. Unfortunately, she did not receive a manual with it and so she doesn’t know the wavelength that it emits. You help her by performing a double-slit experiment, with slits separated by 0.18 mmmm. You find that two adjacent bright fringes are 4.9 mmmm apart on a screen 1.4 mm from the slits.
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Physics
4 years
2021-07-29T20:16:49+00:00
2021-07-29T20:16:49+00:00 2 Answers
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Answers ( )
Answer:
Explanation:
The equation of the fringe in a double slit experiment is given by:
here:
Therefor we just need to solve the equation (1) for λ:
I hope it helps you!
Answer:
6.3*10^-7m
Explanation:
to find the wavelength of the laser you can use the following formula:
y: height from the center of the screen to a fringe
m: order of the fringe
D: distance to the screen = 1.4m
d: distance between slits = 0.18mm
you know the separation of two fringes. Hence, you can use two consecutive fringes to find the wavelength in the following way:
hence, the walength is 6.3*10^-7m