Who produced electromagnetic waves for the first time ?
Who produced electromagnetic waves for the first time ?
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Cathode rays consist of
Cathode rays consist of
Which scientist invented cathode rays ?
Which scientist invented cathode rays ?
Write and explain methods to obtain emission of electron from metal.
Write and explain methods to obtain emission of electron from metal.
What is charge on an electron ?
What is charge on an electron ?
An electron initially at rest, is accelerated through a potential difference of $ 200$ volt, so that it acquires a velocity $8.4 \times {10^6}m/s.$ The value of $e/m$ of electron will be
An electron initially at rest, is accelerated through a potential difference of $ 200$ volt, so that it acquires a velocity $8.4 \times {10^6}m/s.$ The value of $e/m$ of electron will be