Dual Nature of Radiation and Matter - Result Question 17

18. Which one of the following statements is not true for cathode rays?

[2002]

(a) Cathode rays produce heat when incident on metals

(b) Cathode rays travel in a straight line

(c) Cathode rays do not deflect in electric field

(d) Cathode rays produce fluorescence when they fall on certain meterials

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Answer:

Correct Answer: 18. (c)

Solution:

  1. (c) Cathode rays are negatively charged rays. Hence, when electric field is applied to them, then they deflect in direction opposite to electric field.