If a proton were traveling the same speed as electrons in a TV picture tube (about 7.3 10 7 m/s), what would its de Broglie wavelength be?

If a proton were traveling the same speed as electrons in a TV picture tube (about 7.3 107 m/s), what would its de Broglie wavelength be? The mass of a proton is 1.67 10-27 kg.

Answer must be in meters.

If you are using a constant to do equation please let me know where it is from. Is it from a specific model, periodic table, etc.? I would like to figure out how to work similar problems out myself without constantly asking for help.