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Chemistry:The Central Science
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#Post#: 1344--------------------------------------------------
Daily question-10
DIR By: Shiva
Date: December 1, 2012, 12:35 pm
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The ratio e/m for a cathode ray
(a) Has the smallest value when the discharge tube is filled
with hydrogen
(b) is fixed
(c) Varies with the atomic number of an element constituting the
cathode in the discharge tube
(d) Varies with the atomic number of the gas in the discharge
tube
#Post#: 1345--------------------------------------------------
Re: Daily question-10
DIR By: Michel
Date: December 1, 2012, 12:45 pm
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--- Quote from: Shiva link ---
>
> The ratio e/m for a cathode ray
>
> (a) Has the smallest value when the discharge tube is filled
with hydrogen
> (b) is fixed
> (c) Varies with the atomic number of an element constituting
the cathode in the discharge tube
> (d) Varies with the atomic number of the gas in the discharge
tube
>
--- End Quote ---
is fixed, or could be whole number multiples of the fundamental
ratio..
#Post#: 1354--------------------------------------------------
Re: Daily question-10
DIR By: Shiva
Date: December 2, 2012, 11:21 am
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Yes, it is :-) J.J Thomson had calculated the charge to mass
ratio of the electrons. Its value is -1.76*1011C Kg-1 However,
the magnitude of the charge on electron was determined by
Millikan through his famous oil drop experiment.
Shiva
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