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When an electric field is applied across...

When an electric field is applied across a semiconductor,

A

electrons move from lower energy level to higher energy level in the conduction band

B

electrons move from higher enrgy level to lower energy level in the conduction band

C

holes in the valnece band move from higher energy level to lower energy level

D

holes in the valence band move from lower energy level to higher energy level

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Knowledge Check

  • An electric field is applied across a semiconductor. Let n be the number of charge carries. As temperature increases, n will

    A
    increase
    B
    decrease
    C
    does not change
    D
    may increase or decrease

  • When electric field is applied inside a conductor then free electron are accelerated. Their average velocity in time interval t is proportional to

    A
    `t^(1)`
    B
    `t^(2)`
    C
    `sqrt(t)`
    D
    `t^(0 )`

  • Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?

    A
    Reverse osmosis takes place
    B
    Electroosmosis takes place
    C
    Dispersion medium begins to move
    D
    Dispersion medium becomes stationary

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    When in electric field is applied to a metallic conductor at room temperature the thermal speed of electrons is……….and drift velocity of electrons is …….

    An electric field is applied to a semiconductor. Let the number of charge carries be n and the average drift speed be v. if the temperature is increased, then

    An electric field us applied to a semiconductor.Let the number of charge carriers be n and the average drift speed be v.If the temperature is increased,

    We know that electric current flows through a conductor only when some electric field is applied across it. This electric field applied constant force on electrons. But the motion of electrons is not accelerated . Why ?

    Show that drift velocity is in a direction opposite to the drirection of electric field applied across two ends of the conductor.

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