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Question: \(14 \times 10^{15}\) electrons reach the anode per second. If the power consumed is 448 milliwatts,...

14×101514 \times 10^{15} electrons reach the anode per second. If the power consumed is 448 milliwatts, then the plate (anode) voltage is

A

150 V

B

200V

C

14×448V14 \times 448V

D

448/14V

Answer

200V

Explanation

Solution

P=Vi⇒V=Pi=448×10−314×1015×1.6×10−19=200VP = Vi \Rightarrow V = \frac{P}{i} = \frac{448 \times 10^{- 3}}{14 \times 10^{15} \times 1.6 \times 10^{- 19}} = 200V