Cathode rays are
Positive rays
Neutral rays
He rays
Electron waves
(d)Cathode rays are beam of electrons.
The ratio of momenta of an electron and an $\alpha – $particle which are accelerated from rest by a potential difference of $100 V$ is
An electron is moving in electric field and magnetic field it will gain energy from
Which particles are responsible for conductivity of metals ?
A charge of magnitude $3e$ and mass $2m$ is moving in an electric field $\overrightarrow E .$ The acceleration imparted to the charge is
What is the unit of energy in atomic and nuclear physics ? Define it.
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