In an NMR diffuison experiment, a minimum 30% reduction in the nomalised NMR signal attenuation value (E) is requried to achieve a relatively accurate diffusion measurement (e.g. a starting E value of 0.90 corresponding to the starting gradient strength value and a final E value of 0.60 corresponding to the final gradient strength value). It is known that the starting E value is equal to 0.943 corresponding to a magnetic field gradient strength (g) of 0.168 T/m. Please calculate the required gradient strengh to achieve an 74.087 per cent reduction in E.