Question

What is the wavelength of a photon of energy 1eV?

• A. 12.4 × 10³ Å
• B. 2.4 × 10³ Å
• C. 0.4 × 10² Å
• D. None of these

Answer 1

Answer: (A)

12.4 × 10³ Å

Answer 2

p = mc =

λ = $\frac { \mathrm { hc } } { \mathrm { E } } = \frac { 6.6 \times 10 ^ { - 34 } \times 3 \times 10 ^ { 8 } } { 1 \times 1.6 \times 10 ^ { - 19 } }$= 12.375 × 10³ Å