What evidence from j. j. thomson's experiments with the cathode ray led to the plum pudding model of the atom?

I found the choices:

A. The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.

B. The beam was attracted to a negative charge and repelled by a positive charge, showing that atoms contain small, positively charged particles.

C. The beam was positively charged and had significant mass, showing that atoms have a positive, dense nucleus.

D. The beam was neutral and had significant mass, showing that atoms contain neutral particles in the nucleus.

A. The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.

Explanation:

J.J Thomson in 1897 carried out experiments on the gas discharge tube which led to the discovery of cathode rays also known as electrons. He observed the following properties:

The last property led the plum pudding model of the atom. In this model Thomson suggested an atom as pool of electron surrounded by positive charges based on the fact that cathode rays attracts positive charges.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.