Which of the following properties prove that cathode rays are material in nature_________________?
Correct answer: B. they possess momentum
- A. they cast shadow
- B. they possess momentum
- C. they are negatively charged
- D. all of the above
Explanation
Cathode rays possess momentum, showing that they consist of moving particles with mass, namely electrons. Casting shadows shows that the rays travel in straight lines, while negative charge alone identifies their charge but does not by itself prove their material nature. The likely mistake is choosing all of the above by treating every cathode-ray property as direct evidence of material nature.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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