[填空题]
1.Young's double slit experiment is used to determine the wavelength of a monochromatic light source.
The separation between the two slits $d = 0.15 ± 0.01\,mm$.
The distance between the double slit and the screen $D= 1.30 ± 0.05\,mm$.
The distance between the bright fringes $s= 3.2 ± 0.1\,mm$.
(1)Explain why a double slit is used instead of two light sources.
(2)Determine the wavelength of the light, including its uncertainty.1 significant figure。 λ = nm
2 significant figure λ = nm
(3)The experiment is repeated with a larger distance D but the same measurement tools were used.
State and explain the impact of this change on the uncertainty on the calculated value for wavelength.
2.(1)The experiment was repeated by changing the separation between the slits and the screen.
The graph shows the variation of the distance between the bright fringes $s$ and the distance between the double slit and the screen $D$.
Describe without calculations how the wavelength can be determined using the graph.
(2)State the effect of increasing the number of slits on the intensity of the fringes and on the experimental result for the wavelength.
