Posted by Angel on Tuesday, April 10, 2012 at 5:49pm.
Light falls on a double slit with slit separation
of 2.19 × 10
−6 m, and the ﬁrst bright fringe is
seen at an angle of 12.7
relative to the central
What is the wavelength of the light?
Answer in units of nm
- Physics - Elena, Tuesday, April 10, 2012 at 6:00pm
λ = d• tanα = 2.19•10^-6 • 0.225 =4.94 •10^-7 m = 494 nm
- Physics - Angel, Tuesday, April 10, 2012 at 6:03pm
It says incorrect. Can you explain the process?
- Physics - Elena, Tuesday, April 10, 2012 at 6:32pm
The coordinate of the k-maximum (separation between the central and the first maxima) is
x(max) = k•λ•L/d,
where L is the separation between the slits and the screen, d is the separation between the slits.
Now, imagine the triangle : the midpoint between slits (taking into account that the slits are very close to each other, this point is the slit), the central maximum on the screen, and the first bright fringe. In this triangle
tan α = x(1max)/L
x(1max) = L •tan α
Then for k=1
x(1max) = λ•L/d,
L •tan α =λ•L/d,
tan α = λ/d,
Answer this Question
More Related Questions
- Physics - Light falls on a double slit with slit separation of 2.19 × 10 −...
- physics - Light falls on a double slit with slit separation of 2.45×10^−6m...
- physics - At most, how many bright fringes can be formed on either side of the ...
- physics - In a Young's double-slit experiment, the angle that locates the second...
- AP PHYSICS - In a Young's double-slit experiment, the angle that locates the ...
- Physics - In a single-slit diffraction pattern on a flat screen, the central ...
- Physics - A single-slit diffraction pattern is formed on a distant screen. If ...
- physics - A double slit diffraction pattern is formed on a distant screen using ...
- Physics - Light with a wavelength of 500 nm (5. 10-7 m) is incident upon a ...
- Physics - A double-slit interference experiment is performed with light from a ...