What is charge on an electron ? 

Positive rays consists of

An electron is accelerated through a potential difference of $1000$ volts. Its velocity is nearly

If an electron oscillates at a frequency of $ 1 GHz$  it gives

${O^{ + + }},\;{C^ + },\;H{e^{ + + }}$ and ${H^ + }$ ions are projected on the photographic plate with same velocity in a mass spectrograph. Which one will strike farthest

Which is not true with respect to the cathode rays