The e/m value is maximum for _ gas because of _ value of "m" for positive rays obtained from it.
Correct answer: C. Hydrogen gas, lowest
- A. Oxygen gas, lowest
- B. Hydrogen gas, highest
- C. Hydrogen gas, lowest
- D. Helium gas, highest
Explanation
Correct option is C. The highest value of e/m of anode rays has been observed when the discharge tube is filled with hydrogen. Anode rays consist of positively charged ions obtained by removal of one or more electrons from neutral gaseous atoms. Among the given gases, Hydrogen has the least mass. Hence, it has a maximum value of e/m.
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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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