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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. |
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Answer» 1.89 mm 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 |
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