A hot filament liberates an electron with zero initial velocity. The anode potential is $1200 \, \text{V}$. The speed of the electron when it strikes the anode is:

Question

$2.5 \times 10^8 \, \text{m/s}$

$1.5 \times 10^5 \, \text{m/s}$

$2.5 \times 10^6 \, \text{m/s}$

$2.1 \times 10^7 \, \text{m/s}$

Solution

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