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In a transistor if \alpha varies between \frac{20}{21} and \frac{100}{101}, then the value of  \beta lies between:

Option: 1

1-10


Option: 2

0.95 - 0.99


Option: 3

20 - 100


Option: 4

200 - 300


Answers (1)

best_answer

The \alpha and \beta are related by the relation 

        \beta=\frac{\alpha}{1-\alpha}
for   \alpha=\frac{20}{21}

      \beta=\frac{\frac{20}{21}}{1-\frac{20}{21}}=\frac{\frac{20}{21}}{\frac{1}{21}}=20

For\: \: \alpha=\frac{100}{101}

        \beta=\frac{\frac{100}{101}}{1-\frac{100}{101}}=\frac{\frac{100}{101}}{\frac{1}{101}}=100

Thus the value of \beta lies between 20 – 100.

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mansi

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