SATHEE: Modern Physics 6 Question 22

Modern Physics 6 Question 22

24. A diode detector is used to detect an amplitude modulated wave of $60$ modulation by using a condenser of capacity $250 p F$ in parallel with a load resistance $100 k Ω$ . Find the maximum modulated frequency which could be detected by it.

(2013 Main)

(a) $10.62 M H z$

(b) $10.62 k H z$

(c) $5.31 M H z$

(d) $5.31 k H z$

Show Answer

Solution:

The higher frequency which can be detected with tolerable distortion is

$\begin{aligned} f & = \frac{1}{2 π m_{a} R C} = \frac{1}{2 π \times 0.6 \times 2.5 \times 10^{- 5}} H z \\ = \frac{100 \times 10^{4}}{25 \times 1.2 π} H z = \frac{4}{1.2 π} \times 10^{4} H z = 10.61 k H z \end{aligned}$

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Modern Physics 6 Question 22

24. A diode detector is used to detect an amplitude modulated wave of 60 modulation by using a condenser of capacity 250pF in parallel with a load resistance 100kΩ. Find the maximum modulated frequency which could be detected by it.

Solution:

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24. A diode detector is used to detect an amplitude modulated wave of $60$ modulation by using a condenser of capacity $250 p F$ in parallel with a load resistance $100 k Ω$ . Find the maximum modulated frequency which could be detected by it.