A beam of electrons of energy E scatters from a target having atomic spacing of 1 Å . The first maximum intensity occurs at θ = 60 ° . Then E ( in eV ) is........ (Planck's constant h = 6 . 64 × 10 - 34 Js , 1 eV = 1 . 6 × 10 - 19 J , electron mass m = 9 . 1 × 10 - 31 kg )

Question

A beam of electrons of energy E scatters from a target having atomic spacing of 1 Å . The first maximum intensity occurs at θ = 60 ° . Then E ( in eV ) is........ (Planck's constant h = 6 . 64 × 10 - 34 Js , 1 eV = 1 . 6 × 10 - 19 J , electron mass m = 9 . 1 × 10 - 31 kg ),

MARKS App · Accepted Answer

2 dsin θ = n λ 2 d 3 2 = 1 λ d = 1 Å λ = 3 Å λ = 3 = 150 V V = 50 volt E = 50 eV

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