MCQ
Cathode rays have
- AMass only
- BCharge only
- CNo mass and charge
- ✓Mass and charge both
Cathode rays are stream of electrons that are negatively charged particles. Cathode rays travel in straight lines from the cathode. The ratio of $e / m$ for a cathode ray is fixed at $1.758820 \times 10^{11} \,C / kg$. It is equal to the ratio of $e / m$ for an electron.
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(Assume: Momentum is conserved when photon is absorbed. Use: Planck constant $=6.6 \times 10^{-34} J s$, Avogadro number $=6 \times 10^{23} mol ^{-1}$, Molar mass of $He =4 g mol ^{-1}$ )