The charge on electron was discovered by
J.J. Thomson
Neil Bohr
Millikan
Chadwick
Write speed of cathode rays.
A metal plate gets heated, when cathode rays strike against, it due to
An electron of charge $‘e’$ coulomb passes through a potential difference of $V$ volts. Its energy in ‘joules’ will be
An electron is accelerated through a potential difference of $1000$ volts. Its velocity is nearly
A narrow electron beam passes undeviated through an electric field $E = 3 \times {10^4}volt/m$ and an overlapping magnetic field $B = 2 \times {10^{ - 3}}Weber/{m^2}$. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is