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Author Question: Ray says that interference effects cannot be observed with visible light because random phase ... (Read 93 times)

vHAUNG6011

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on: Aug 10, 2020

Question 1

Monochromatic light (λ = 500 nm) is incident on a soap bubble (n = 1.40). How thick is the bubble (in nm) if destructive interference occurs in the reflected light?

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102

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179

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54

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1

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89


Question 2

Ray says that interference effects cannot be observed with visible light because random phase changes occur in time intervals less than a nanosecond. Stacy says that doesn't matter if collimated light from a single source reaches multiple openings. (They are arguing about a light source 50.0 cm away from two 0.010 0 mm-wide slits, 2.00 mm apart, with a screen 1.00 m away from the slits.) Which one, if either, is correct, and why?

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Ray, because the phases at the two slits will be random and different.

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Ray, because it takes light over 3 ns to travel 1.00 m to the screen.

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Stacy, because the difference in time of travel from the source to the slits is no more than about 7 × 10−12 s.

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Stacy, but only if a lens is placed in front of the slits.

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Both, because interference of light never occurs outside a physics lab.
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Marked as best answer by vHAUNG6011 on Aug 10, 2020

Kingjoffery

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Reply #1 on: Aug 10, 2020
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vHAUNG6011

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Reply 2 on: Aug 10, 2020
Thanks for the timely response, appreciate it

raili21

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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