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Why theoretical value does not agree with experimental value?

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Knowledge Check

  • In Davisson-Germer experiment, observed value of de-Broglie's wavelength is 0.165 nm whereas theoretical value is 0.166 nm. Choose the correct reason for a lower experimental value.

    A
    Error in observation of angle at which maxima of intensity of diffracted electron occurs
    B
    Temperature of nickel crystal is more than the ambient temperature
    C
    Electron speed inside the crystal is more than `sqrt ((2qV)/(m))` and no account is made to calculate this increase of speed
    D
    Electron behave like waves in ths experiment.

  • In Davisson-Germer experiment, observed value of de-Broglie's wavelength is 0.165 nm whereas theoretical value is 0.166 nm. Choose the correct reason for a lower experimental value.

    A
    Error in observation of angle at which maxima of intensity of diffracted electron occurs
    B
    Temperature of nickel crystal is more than the ambient temperature
    C
    Electron speed inside the crystal is more than `sqrt(((2qV)/m))` and no account is made to calculate this increase of speed
    D
    Electron behave like waves in ths experiment.

  • If the molecule of HCl were totally polar, the expected value of dipole moment is 6.12 D (debye), but the experimental value of dipole moment was 1.03D . Calculate the percentage ionic character:

    A
    17
    B
    83
    C
    50
    D
    zero

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