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प्रश्न
Why does a light paddle wheel placed in the path of cathode rays begin to rotate, when cathode rays fall on it?
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उत्तर
It is because the small particles of the cathode rays (electrons) have mass and energy. This energy is used in rotating the paddle wheels.
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संबंधित प्रश्न
State the law of conversation of mass.
If an object is taken to the moon from the earth what will be its mass ?
Give reason for the following.
Electricity is not considered matter.
Name the law of chemical combination which was given by Lavoisier.
Name the law of chemical combination which was given by Proust.
State the law of conservation of mass. Give one example to illustrate this law.
An ionic compound will be formed by the combination of one of the following pairs of elements. This pair of elements is :
State the main points of Landolt’s experiment for experimental evidence of the law.
Match the following.
| Law of conservation of mass | Sir William Crookes |
| Law of constant proportion | James Chadwick |
| Cathode rays | Joseph Proust |
| Anode rays | Lavoisier |
| Neutrons | Goldstein |
Name the four laws of chemical combinations.
