posted by C. on .
Under the correct conditions, the element molybdenum emits X-rays with a characteristic wavelength of 0.711A (7.11*10^-11m). These X-rays are used in diffraction experiments to determine molecular structures. How fast does an electron need to be moving to have the same wavelength as these X-rays?
7.11*10^-11m= (6.626*10^-34J*s) / mv
I'm stuck. How do I know what "m" is? Is it just the atomic mass of Molybdenum, 95.9amu?