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    Millikan experiment, Compton effect, photoelectric effect

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    1. In a Millikan oil drop experiment the terminal velocity of the droplet is observed to be vt = 1.5 mm/s. The density of the oil is = 830 kg/m3 and the viscosity of air is = 1.82 10-5 kg/m s. Use the following equations to find the values below.

    Calculate the droplet radius.
    µm
    (b) Calculate the mass of the droplet.
    kg
    (c) Calculate the coefficient of friction.
    kg/s

    12. A gamma ray of 630 keV energy Compton scatters from an electron. Find the energy of the photon scattered at 89°, the kinetic energy of the scattered electron, and the recoil angle of the electron.
    keV (photon)
    keV (electron)
    °

    3. What is the threshold frequency for the photoelectric effect of barium ( = 2.5 eV)?
    Hz
    What is the stopping potential if the wavelength of the incident light is 420 nm?
    eV

    4. Light from a slit passes through a transmission diffraction grating of 330 lines/mm, which is located 2.2 m from a screen. What are the distances on the screen (from the unscattered slit image) of the three brightest visible (first-order) hydrogen lines?
    Red cm

    Blue-green cm

    Violet cm

    3. In a Millikan oil drop experiment the terminal velocity of the droplet is observed to be vt = 1.5 mm/s. The density of the oil is = 830 kg/m3 and the viscosity of air is = 1.82 10-5 kg/m s. Use the following equations to find the values below.

    (b) Calculate the droplet radius.
    µm
    (b) Calculate the mass of the droplet.
    kg
    (c) Calculate the coefficient of friction.
    kg/s

    4. Light from a slit passes through a transmission diffraction grating of 330 lines/mm, which is located 2.2 m from a screen. What are the distances on the screen (from the unscattered slit image) of the three brightest visible (first-order) hydrogen lines?

    Red cm

    Blue-green cm

    Violet cm

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    https://brainmass.com/physics/energy/millikan-experiment-compton-effect-photoelectric-effect-96040

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    1. In a Millikan oil drop experiment the terminal velocity of the droplet is observed to be vt = 1.5 mm/s. The density of the oil is = 830 kg/m3 and the viscosity of air is = 1.82 10-5 kg/m s. Use the following equations to find the values below.

    Calculate the droplet radius.
    µm
    (b) Calculate the mass of the droplet.
    kg
    (c) Calculate the coefficient of friction.
    kg/s

    Solution : _______________________
    a) Radius r = = 3 √1.82x10-5x1.5x10-3/2x9.8x830 = 0.039x10-4 m

    r = 0.039x10-4 m = 0.039x10-4 x 106 μm = 3.9 μm

    b) Mass of the droplet m = Volume x Density = (4/3 Πr3)ρ = 4/3 Π (0.039x10-4)3 x 830 = 0.206 x 10-12 kg

    m = 0.206 x 10-12 kg

    c) Coefficient of friction f = mg/vt = 0.206 x 10-12 x 9.8/1.5x10-3 = 1.35 x 10-9 kg/s

    f = 1.35 x 10-9 kg/s

    12. A gamma ray of 630 keV energy Compton scatters from an electron. Find the energy of the photon scattered at 89°, the kinetic energy of the scattered electron, and the recoil angle of the electron.
    keV (photon)
    keV (electron)
    °
    Y
    Solution :

    Electron Scattered photon
    Incident photon φ ...

    Solution Summary

    This set of miscellanious problems on Millikan oil drop experiment, Compton scattering, photoelectric effect and diffraction grating have been solved explaining the underlying principles involved.

    $2.19

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