Coherent light from a sodium-vapor lamp is passed through a filter that blocks everything except for light of a single wavelength. It then f

Question

Coherent light from a sodium-vapor lamp is passed through a filter that blocks everything except for light of a single wavelength. It then falls on two slits separated by 0.460 mm. In the resulting interference pattern on a screen 2.20 m away, adjacent bright fringes are separated by 2.82 mm. What is the wavelength of the light that falls on the slits

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Vân Khánh 3 years 2021-09-05T00:08:38+00:00 1 Answers 3 views 0

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  1. Doris
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    2021-09-05T00:10:07+00:00
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    Answer:

    5.896\times 10^{-7}\ \text{m}

    Explanation:

    D = Distance of the screen from the light source = 2.2 m

    d = Distance between slits = 0.46 mm

    m = Order

    Distance between adjacent bright fringes is 2.82 m

    y_{m+1}-y_m=2.82\ \text{mm}\\\Rightarrow \dfrac{D(m+1)\lambda}{d}-\dfrac{Dm\lambda}{d}=2.82\times 10^{-3}\\\Rightarrow \dfrac{D\lambda}{d}(m+1-m)=2.82\times 10^{-3}\\\Rightarrow \lambda=\dfrac{d}{D}2.82\times 10^{-3}\\\Rightarrow \lambda=\dfrac{0.46\times 10^{-3}\times 2.82\times 10^{-3}}{2.2}\\\Rightarrow \lambda=5.896\times 10^{-7}\ \text{m}

    The wavelength of the light that falls on the slits is 5.896\times 10^{-7}\ \text{m}.

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