Red light of wavelength `5400 Å` from a distant source modulated wave of `60%` modulattion by using a condenser of capacity 250 pF in parallel with a

Question

Red light of wavelength `5400 Å` from a distant source modulated wave of `60%` modulattion by using a condenser of capacity 250 pF in parallel with a

Red light of wavelength `5400 Å` from a distant source modulated wave of `60%` modulattion by using a condenser of capacity 250 pF in parallel with a load resistnce `100kOmega`. Find the maximum modulated frequency which could be detected by it.
A. 1.89 mm
B. 4mm
C. 1 mm
D. 3mm

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
Here, wavelength `lambda = 5400Å=5.4 xx 10^(-7)`m,
a=0.80 mm = `8 xx10^(-4)`m, D=1.4m
`therefore` Distance between first two dark bands on each side of central maximum is the width of central maximum
`=2x = (2lambdaD)/d = (2 xx 5.4 xx 10^(-7) xx 1.4)/(8 xx 10^(-4))`
`=1.89 xx 10^(-3)` m =p1.89 m

5 views Answered 2023-02-05 15:29