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Examen
PHYSICS 41Physics 41 Chapter 38 HW Key question and answers
Physics 41 Chapter 38 HW Key 
1. Helium–neon laser light (632..8 nm) is sent through a 0.300-mm-wide single slit. What is the width 
of the central maximum on a screen 1.00 m from the slit? 
7 
3 
4 
6.328 10 sin 2.11 10 
a 3.00 10 
λ θ 
− − 
− 
× = = = × × tan sin 
1.00 m 
y = ≈≈ θ θθ (for small θ) 
2 4.22 mm y = 
2. A beam of monochromatic green light is diffracted by a slit of width 0.550 mm. The diffraction 
pattern forms on a wall 2.06 m beyond the slit. The distance be...