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JAMB Chemistry 2009 Question 9

Question 9

Atomic Structure

Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays

  1. A.are positively charged
  2. B.are negatively charged
  3. C.have mass
  4. D.travel in straight lines
Show the answer and explanation

Answer: D (travel in straight lines)

Explanation

A sharp shadow forms only if the rays travel in straight lines past the object.