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What is the radius of the path of an ele...

What is the radius of the path of an electron (mass 9 × 10-31 kg and charge `1.6 ×x 10^(–19)` C) moving at a speed of `3 ×x10^7 ` m/s in a magnetic field of `6 x× 10^(-4)` T perpendicular to it? What is its frequency? Calculate its energy in keV. `(1eV = 1.6 xx 10^(-19) J)`

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What is the radius of the path of an electron (mass 9xx10^(-31)" kg and charge "1.6xx10^(-19)C) moving at a speed of 3xx10^(7)m//s in a magnetic field of 6xx10^(-4)T perpendicular to it ? What is its frequency ? Calculate its energy in keV. (1 eV = 1.6xx10^(-19)J) .

Calculate the wave length of an electron of mass 9.1 xx 10^(-31) kg , moving with a velocity of 2.05 xx 10^(7)ms^(-1) .

Knowledge Check

  • Uncertainity in the position of an electron (mass = 9.1 xx 10^(-31) kg ) moving with a velocity 300 ms^(-1) accurate upto 0.001% will be (h = 6.63 xx 10^(-34) Js)

    A
    `3.84 xx 10^(-2)m`
    B
    `19.2 xx 10^(-2)m`
    C
    `5.76 xx 10^(-2)m`
    D
    `1.92 xx 10^(-2)m`

  • Uncertainity in the position of an electron (mass = 9.1 xx 10^(-31) kg ) moving with a velocity 300 ms^(-1) accurate upto 0.001% will be (h = 6.63 xx 10^(-34) Js)

    A
    `19.2 xx 10^(-2)m`
    B
    `5.76 xx 10^(-2) m`
    C
    `1.92 xx 10^(-2) m`
    D
    `3.84 xx 10^(-2)m`

  • The wavelength of a charged particle of mass 8.0xx10^(-31) kg, charge 1.6xx10^(-19)C and kinetic energy 3 keV will be ( Planck constant, h=6.4xx10^(-34)Js )

    A
    `0.4 Å`
    B
    2.1 Å
    C
    1.0 Å
    D
    1 Å

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