Homework 1B 21

[keyaluo4C]

I can only get the answer to this question of 1.78E-31 m when I don't convert 92 miles to meters. Is this a mistake?

[ChathuriGunasekera1D]

Hi! I have 6th edition but I think you're talking about the baseball problem. You use De Broglie's equation for this problem. m would equal the mass, and you need to convert 5.15 oz to kilograms, which is 145.745 x 10^3 g. If you convert 92 mph to m/s you get 41.128 m/s as the velocity. You are given h, so now you plug it it to De Broglie's.

wavelenghth = (h) / (mv)
(6.626 x 10^-34 Js) / (145.745 g x 10^3 x 41.128 m/s)
= 1.1 x 10^ -34 and that matches the answer in the 6th edition book.

If you're not talking about the baseball problem, please ignore everything.