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Cathode rays, discovered by J.J. Thomson in 1897, are streams of:
ANegatively charged particles (later called electrons)
BLight photons
CPositive particles
DNeutral atoms
Answer & Solution
Correct answer: A. Negatively charged particles (later called electrons)
Thomson found that cathode rays deflect toward the positive plate in an electric field — meaning they carry NEGATIVE charge. They have a much smaller mass than any atom. These particles are called electrons. Their discovery proved that atoms have internal structure.
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