please explain term velocity selector

Asked by vinodjoshi112233 | 12th Jun, 2017, 06:37: AM

Expert Answer:

-Velocity selector is a device consisting of perpendicular electric field (F = qE) and magnetic fields  (F = qvB) that can be used as a velocity filter for charged particles.
-Devices like electron microscopes and spectrometers use this principle for operating. 
-It is used in accelerator mass spectrometry to select particles based on their speed.
-Velocity selector segregates the particles such that the particles with the correct speed remain unaffected or undeflected while other particles will be deflected.
-Wilhelm Wien developed this phenomenon in the year 1898 for the study of anode rays and therefore velocity selector is also called Wien Selector. 

Answered by Abhijeet Mishra | 12th Jun, 2017, 11:32: AM