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Dual Nature of Radiation and Matter Test - 9

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Dual Nature of Radiation and Matter Test - 9
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  • Question 1
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    Uniform electric and magnetic fields are produced pointing in the same direction. An electron is projected pointing in the same direction, then

    Solution

    Electron will not experience any force due to magnetic field as direction of velocity is parallel to direction of magnetic field since magnetic force = qvBsinθ.
    Due to electric field, force on electron will be in direction opposite to that of electric field, hence opposite to direction of motion of electron. Hence it will deaccelerate and its velocity will decrease.

  • Question 2
    1 / -0

    In Thomson’s method for finding specific charge of positive rays, the electric and magnetic fields are

    Solution

    Specific charge can be determined when the charge moves in both magnetic field and electric field which are mutually perpendicular to each other so that the net force on it is made zero. In this situation, the direction of motion of charge remains perpendicular to both electric and magnetic field.

  • Question 3
    1 / -0

    The specific charge for positive rays is much less than that for cathode rays. This is because

    Solution

    Specific charge is e/m ratio. Mass of cathode rays is much greater than positive rays. Hence specific charge of positive rays is much less than cathode rays.

  • Question 4
    1 / -0

    The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential is

    Solution

    eV0 = Kmax
    eV0 = 4eV
    So, V0 = 4V

  • Question 5
    1 / -0

    The time taken by a photoelectron to come out after the photon strikes is approximatley:

    Solution

    There is a time lag of about 10-10 s between the incidence of photon and photoelectron emission.

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