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The student measures the distance s between the central maximum and the second order maximum on the screen.
The experiment is repeated for different wavelengths of light.
It is suggested that s and the wavelength λ are related by the equation
s^2
-----
s^2 + D^2 = 4N^2λ^2
where D is the distance between the diffraction grating and the screen and N is the number of lines per unit length of the diffraction grating.
(a) A graph is plotted of 1/s^2 on the y-axis against 1/λ^2 on the x-axis.
Determine expressions for the gradient and y-intercept.?
Sagot :
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