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Find the speed of the 2nd-order maxima on the screen

  • Thread starter burgerkin
  • Start date
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1. Homework Statement

A man holds a light that emits light of wavelength λ. The light beam passes though a pair of slits separated by a distance d, in a screen plate attached to the front of the light beam(double slits experiment). The beam then falls perpendicularly on a screen, getting an interference pattern on it. The man walks straight toward the screen at speed v. The central maximum on the screen is stationary. Find the speed of the 2nd-order maxima on the screen, where m can be very large. (Use variable or symbol )

2. Homework Equations

y=[tex]\lambda[/tex]L m / d


3. The Attempt at a Solution

L changes with v, and y changes with v

so y = [tex]\lambda[/tex] v t m /d

then v 2nd order maximum (m=2) = y' = [tex]\lambda[/tex] v m /d
1. Homework Statement



2. Homework Equations



3. The Attempt at a Solution
 

Redbelly98

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3. The Attempt at a Solution

L changes with v, and y changes with v

so y = λ v t m /d

then v 2nd order maximum (m=2) = y' = λ v m /d
Your answer looks correct for small angles, even though L is not really equal to v·t.

I am puzzled by this statement:
Find the speed of the 2nd-order maxima on the screen, where m can be very large
For the 2nd-order maxima, m is 2, which is not a large number. Are you sure you typed this part of the question exactly as it was written in the problem statement?
 

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