A Proton Has a Speed Of $7.2 \times 10 ^ { 4 } \mathrm {~m} / \mathrm { s }$

Multiple Choice

A proton has a speed of $7.2 \times 10 ^ { 4 } \mathrm {~m} / \mathrm { s }$ . What is the energy of a photon that has the same wavelength as the de Broglie wavelength of this proton? $\left( m _ { \text {electron } } = 9.11 \times 10 ^ { - 31 } \mathrm {~kg} , c = 3.00 \times \right.$ $\left. 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

A) $440 \mathrm { keV }$
B) $150 \mathrm { keV }$
C) $230 \mathrm { keV }$
D) $370 \mathrm { keV }$
E) $300 \mathrm { keV }$