You decide to roll a 0.14-kg ball across the floor so slowly that it will have a small momentum and a large de Broglie wavelength. If you roll it at 9 0x10-4m/s , what is its wavelength? Express your answer to two significant figures and include the appropriate units. How does this compare with the de Broglie wavelength of the high-speed electron that strikes the back face of one of the early models of a TV screen at 1/10 the speed of light (2.4 x 10-11 m)? Express your answer using two significant figures.