Question

Calculate the wavelength of photon associated with an energy of $1$ electron volt.

• A. $19.875\times {10}^{-17}cm$
• B. $1.24\times {10}^{-5}cm$
• C. $12.41\times {10}^{-5}cm$
• D. $20.11\times {10}^{-5}cm$

Answer 1

Answer: (C)

$12.41\times {10}^{-5}cm$

$\lambda =\frac{hc}{E_{Ph}}$

$\lambda =\frac{6.625\times {10}^{-34}\times 3\times {10}^8}{{1.6\times 10}^{-19}}=1242nm=12.42\times {10}^{-5}cm$