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# Engineering

A beam of electrons of energy E scatters from a target having atomic spacing of 1\AA. The first maximum intensity occurs at \theta =60^{\circ}. Then E (in eV) is _______. (Plank constant h=6.64\times 10^{-34}Js,                            1\; eV=1.6\times 10^{-19}J, electron mass m=9.1\times 10^{-31}kg)
Option: 1 50.47
Option: 2 100.94
Option: 3 40.47
Option: 4 80

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