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[" In a photo-emissive cell,with exciting wavelength "lambda," the fastest electron has speed u.If the exciting wavelength "],[" is changed to "3x/4" ,the speed of the fastest emitted electron will be "],[[" (A) "(1)/(4)(3/4)^(1/2)," (B) "v(4/3)^(12)," (C) Less than "v(4/3)^(1/2)," (D) Greater than "v(4/3)^(1/2)]]

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