Answer:
option B is correct : The beam was positively charged.
Explanation:
In 19th century J.J Thomson conducted an experiment on cathode ray tube. These cathode ray tubes were sealed glass tubes inside which the pressure of the gas reduced by evacuating air. Then he applied a high voltage across two electrodes at end of the tube, that voltage caused a beam of particles to flow from the cathode to the anode.
Beam of the particles were originated at the cathode and detected on anode by a phosphorous beyond the anode. As at that time phosphorous sparks and emit light.
To test properties of particles he places two opposite charged electric plates around the cathode rays that is one negative and one positive plate.
Thomson observed that these rays deflected to positive electric plate so it indicated that these rays are composed of negatively charged particles as it was attracted by the positive charged electric plate. These particles later named as electrons.
So,
option B is correct : The beam was positively charged.
Iodine -131 is used to detect thyroid malfunction in the human body as iodide salts exploit the mechanism of absorption of iodine by the normal cells of the thyroid gland
it might look like it has disappeared, but in fact it has just mixed with the water to make a transparent
Answer:
a
Explanation:
due to the concentration of the ag+
The answer is- Magnitude of melting point of group 1A metals decreases down the group.
The melting point is the temperature at which a given solid material changes from a solid state to a liquid or melt state.
On what factors, the melting point of an atom depends?
- The melting point is governed by the attraction of the electrons of an atom towards its nucleus.
- Thus, size of the ion plays crucial role. Smaller the size of ion, greater is the attraction and thus greater is the melting point.
- Now, Group 1A elements are also called alkali metals and they include Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium.
- As moving down the group, the size of atom increases , thus the attraction between the electrons and nucleus decreases, and thus the melting point decreases.
To learn more about the melting point of alkali metals, visit:
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