An electron of momentum 400 assuming no recoil, find the momentum transfer and its reduced de broglie wavelength. mev/c is scattered at an angle of 15 deg by a calcium nucleus also calculate the mott differential cross-section (point-like nucleus), and by what factor it is reduced if the calcium nucleus (a-40) can be assumed to be represented buy a model of a sphere with radius a 1.2 a fm (model i in fig. 3 of williams)