Which gas in the discharge tube produces lightest canal ray particles?
Correct answer: C. H2
- A. Ar
- B. He
- C. H2
- D. Ne
Explanation
Canal rays are positively charged ions that are produced in a discharge tube when a high voltage is applied across a gas at low pressure. These rays are defected by electric and magnetic fields, and their deflection depends on their charge-to-mass ratio. Hydrogen has the lowest atomic mass compared to Ar, Me, and He. Since, the mass-to-charge ratio determines the deflection of canal rays, the lighter the particles, the greater their deflection. Therefore, H2 produces the lightest canal ray particles among the given options.
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