10. Electrons that have been accelerated from rest through a potential difference of 150 volts have a de Broglie wavelength of approximately 1 Angstrom ( 10−10 meter). In order to obtain electrons whose de Broglie wavelength is 0.5 Angstrom ( 5×10−11 meter), what accelerating potential is required?
(A) 37.5 V
(B) 75 V
(C) 300 V
(D) 600 V
(A) 37.5 V
(B) 75 V
(C) 300 V
(D) 600 V