Discussion
Which of the following statements are correct about canal rays?
(i) They carry positively charged particles.
(ii) The mass of the particles of these rays does not depend upon the gas present in the cathode ray tube.
(iii) The particles behave in a different manner in electric field as those of cathode rays.
(iv) The charge to mass ratio of the particles does not depends on the gas present in the cathode ray tube.
Answer: E
The correct statements are (i) and (iii).
Canal rays (anode rays) are streams of positive ions formed from the gas in the discharge tube, so (i) is right, and being positively charged they are deflected in the opposite direction to cathode rays in an electric field, so (iii) is right.
(ii) and (iv) are wrong: the particles are ions of whatever gas fills the tube, so both their mass and their charge-to-mass ratio depend on that gas (hydrogen gives the lightest, the proton). This is the key difference from cathode rays, whose e/m is the same for every gas.
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