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Which of the following statements is not true about canal rays?

1. They travel in straight line.
2. They are made up of positively charged particles.
3. Their e/m ratio is same for all gases.
4. These rays produce fluorescence on \( Z n S \) screen.

Correct answer: Their e/m ratio is same for all gases.

Solution

Canal rays consist of positive ions, and their charge-to-mass ratio depends on the nature of those ions. Since different gases form different ions, the e/m ratio is not the same for all gases.

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