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Chapter 35 Physics: Interference and Wave Properties

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이 집합의 용어 (15)

  • What letter represents slit separation?
    The letter \(d\) represents slit separation, measured in meters (m).
  • What is the SI unit for distance from slit to screen?

    L measured in meters (m).

  • What physical quantity does the letter \(y\) represent?

    Distance from central maximum to extremum on the screen, measured in meters (m).

  • What is SI unit for thickness of thin film?

    \(t\), measured in meters (m).

  • When does constructive interference occur visually?

    When peak and peak meet

  • When does destructive interference occur visually?

    When peak and though meet

  • When does a phase shift occur on reflection?

    When, \(n_2 > n_1\).

  • Based on path difference: Constructive interference occurs for:

    \(\Delta l = m\lambda\)

  • Based on path difference: Destructive interference occurs for:

    \(\Delta l = (m + \frac{1}{2})\lambda\)

  • For the double, the path difference is:

    \(\Delta l = d \sin(\theta)\)

  • Double slit: The position on the screen relates to the angle as:

    \(\tan \theta = \frac{y}{L}\)

  • The pattern seen on the screen due to the double slit shows this relationship for

    intensity:

    \(I = I_0 \cos^2 \frac{\phi}{2}\)

  • Relationship between phase angle and path difference
    The phase difference \(\phi\) relates to path difference by \(\frac{\Delta l}{\lambda} = \frac{\phi}{2\pi}\).
  • Wavelength in a thin film compared to air wedge

    For a thin film: \(\lambda = \lambda_0 / n\); for an air wedge, \(\lambda = \lambda_0\).

  • What is an integer number in the context of interference?
    An integer number \(m\) is a whole number used to count fringes or orders in interference patterns; it is unitless.