Which particle leaves no track in a Wilson cloud chamber?

Explain the discovery of protons.

Explain the discovery of the electron.

When beryllium is bombarded with $\alpha$-particles,extremely penetrating radiations which cannot be deflected by electrical or magnetic field are given out. These are

From which word is the term $Atom$ derived and what is its meaning?

Which of the following statements is correct about the cathode rays?
$1$. These rays start from anode and move towards cathode.
$2$. They are visible with human eye.
$3$. In presence of electric and magnetic fields,they behave like positively charged particles.
$4$. Their characteristic does not depend on the nature of material at electrode.