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Vigorous contraction of the uterus atthe end of pregnancy causes expulsion/delivery of the fetuscalled as parturition. The signals for parturition originate from the fully developed fetus and the placenta which induces mild uterine contraction is called fetal ejection reflex.
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Aromatic Hydrocarbons are circularly structured organic compounds that contain sigma bonds along with delocalized pi electrons. They are also referred to as arenes or aryl hydrocarbons.
A few examples of aromatic hydrocarbons are provided below. It can be observed that all these compounds contain a benzene ring.
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Acyl chloride (acid chloride) is hydrogenated over catalyst, palladium on barium sulphate. This reaction is called Rosenmund reduction.
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The drift velocity is the average velocity that a particle, such as an electron, attains in a material due to an electric field. It can also be referred to as axial drift velocity. In general, an electron will propagate randomly in a conductor at the Fermi velocity.
When a conductor is subjected to an electric field E, each electron experiences a force
F = - eE, and free electron acquires an
acceleration, a= F/m = - eE/m ... (i)
where, m = mass of electron, e = electronic charge and E = electric field.
Free electron starts accelerating and gains velocity and collide with atoms and molecules of the conductor. The average time difference between two consecutive collisions is known as relaxation time of electron and
{tex}\overline { \tau } = \frac { \tau _ { 1 } + \tau _ { 2 } + \ldots + \tau _ { n } } { n }{/tex} ...(ii)
where, {tex}\tau_{1}, \; \tau_{2}.... \; \tau_{n}{/tex} are the average time difference between 1st, 2nd, ...nth collisions.
{tex}\therefore{/tex} v1, v2, ... vn, are velocities gained by electron in 1st, 2nd, ..., nth collisions with initial thermal velocities u1, u2, ..., un, respectively.
{tex}\therefore \quad { v } _ { 1 } = { u } _ { 1 } + { a } \tau _ { 1 }{/tex}
Similarly,
{tex}\mathop {{v_2}}\limits_ \vdots = \mathop {{u_2}}\limits_ \vdots + \mathop {a{\tau _2}}\limits_ \vdots {/tex}
{tex}{v_n} = {u_n} + a{\tau _2}{/tex}
The drift speed vd may be defined as
{tex}v _ { d } = \frac { v _ { 1 } + v _ { 2 } + \ldots + v _ { n } } { n }{/tex}
{tex}v _ { d } = \frac { \left( u _ { 1 } + u _ { 2 } + \ldots + u _ { n } \right) + a \left( \tau _ { 1 } + \tau _ { 2 } + \ldots + \tau _ { n } \right) } { n }{/tex}
{tex} { v } _ { d } = \frac { \left( { u } _ { 1 } + { u } _ { 2 } + \ldots + { u } _ { n } \right) } { n } + \frac { { a } \left( \tau _ { 1 } + \tau _ { 2 } + \ldots + \tau _ { n } \right) } { n }{/tex}
{tex}v _ { d } = 0 + { a } \tau{/tex} [{tex}\because{/tex} Average thermal velocity in n collisions = 0]
{tex}{ v } _ { d } = - ( e { E } / m ) \tau{/tex} [from Eq. (i)]
This is the required expression of drift speed of free electrons in a conductor in a presence of voltage source.
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