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Interference/Diffraction?
Light falls on a pair of slits 0.00178 cm apart. The slits are 77.4 cm from the screen. The first-order bright line is 1.8 cm from the central bright line.
What is the wavelength of the light? Answer in units of nm.
1 Answer
- ?Lv 72 months agoFavorite Answer
for constructive interference, d*sinΘ = mλ
d = 1.78e-3 cm = 1.78e4 nm
Θ = arctan(1.8/77.4) = 2.33e-2 rads
m = 1 ("first-order bright line")
1.78e4nm * sin(2.33e-2) = 1*λ
λ = 414 nm (violet)
Hope this helps!
Source(s): Was this working helpful? /question/index?qid=20201... citation: https://courses.lumenlearning.com/physics/chapter/...
