Question

What is value of e/m for particles in cathode ray?

Answer 1

The mass-to-charge ratio (m/Q) is a physical quantity that is most widely used in the electrodynamics of charged particles, e.g. in electron optics and ion optics. It appears in the scientific fields of electron microscopy, cathode ray tubes, accelerator physics, nuclear physics, Auger electron spectroscopy, cosmology and mass spectrometry.[1] The importance of the mass-to-charge ratio, according to classical electrodynamics, is that two particles with the same mass-to-charge ratio move in the same path in a vacuum when subjected to the same electric and magnetic fields. Its SI units are kg/C. In rare occasions the thomson has been used as its unit in the field of mass spectrometry.

Some fields use the charge-to-mass ratio (Q/m) instead, which is the multiplicative inverse of the mass-to-charge ratio. The 2014 CODATA recommended value for an electron is  e⁄me = 1.758820024(11)×1011 C/kg.

Answer 2

The value of $\frac {e}{m}$ for particles in cathode ray is $1.758820 \times 10 ^ { 11 } C kg ^ { - 1 }$

Given:

Cathode Ray

To find:

Value of $\frac {e}{m}$

Solution:

A cathode ray is a beam of electrons in a tube consists of vacuum that travels from the negatively charged electrode (cathode) from one side of the end which heading towards the anode (positively charged electrode) at the other.

They're also referred to as a beam of electrons. Cathode ray took into account of the charge to mass ratio. The value of e/m for particles in cathode ray is $1.758820 \times 10 ^ { 11 } C kg ^ { - 1 }$.