(B) Cathode rays are streams of fast-moving electrons. Their speed depends on the potential difference applied between the cathode and the anode. Typi

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(B) Cathode rays are streams of fast-moving electrons. Their speed depends on the potential difference applied between the cathode and the anode. Typically, the speed of cathode rays ranges from $1/10$ to $1/3$ of the speed of light $(c)$, which is approximately $3 \times 10^7 \, m/s$ to $1 \times 10^8 \, m/s$.