\(p-n\) જંકશનને સમાંતર. \(0.4 \,V\) સ્થિતિમાન વિભવ મળે છે. \(n\)- બાજુથી એક ઈલેકટ્રોન જંકશનમાં \(6.0 \times 10^{5} \,ms ^{-1}\) ની ઝડપથી દાખલ થાય છ. \(p\) બાજુમાં દાખલ થતા ઈલેકટ્રોનની ઝડપ \(\frac{x}{3} \times 10^{5} ms ^{-1}\) છે; તો \(x\) =.............. ( ઈલેકટ્રોનનું દળ = \(9 \times 10^{-31} \,kg\) ઇલેક્ટ્રોન પરનો વિદ્યુતભાર \(=1.6 \times 10^{-19} \,C\) આપેલ છે.)

A \(11\)
B \(13\)
C \(14\)
D \(20\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(14\)

Step-by-step Solution

Detailed explanation

Work done by Electric field \(=K_{ r }- K _{ I }\) \(\frac{1}{2} mv ^{2}-\frac{1}{2} mu ^{2}=-1.6-10^{-19} \times 0.4\) \(\frac{1}{2} 9 \times 10^{-31}\left( v ^{2}- u ^{2}\right)=-0.64 \times 10^{-19}\) \(u ^{2}- v ^{2}=\frac{2 \times 0.64 \times 10^{12}}{9}\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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