Assuming that the smallest measurable wavelength in an experiment is 0.550 fm (femtometers), what is the maximum mass of an object traveling at 297 m·s–1 for which the de Broglie wavelength is obse

Assuming that the smallest measurable wavelength in an experiment is 0.550 fm (femtometers), what is the maximum mass of an object traveling at 297 m·s–1 for which the de Broglie wavelength is observable?

please explain how you got the answer