7. IE •• A proton traveling at a speed 4.5 × 104 m/s is then accelerated through a potential difference of 37 V.

(a) Will its de Broglie wavelength (1) increase,

(2) remain the same, or (3) decrease, due to the potential difference? Why?

(b) By what percentage does the de Broglie wavelength of the proton change?