Question

The wavelength of a photon is 500 nm. Calculate its energy. (Planck’s constant \( h = 6.63 \times 10^{-34} \, \text{J·s} \), speed of light \( c = 3 \times 10^8 \, \text{m/s} \))

• A. \( 3.98 \times 10^{-19} \, \text{J} \)
• B. \( 4.14 \times 10^{-19} \, \text{J} \)
• C. \( 5.24 \times 10^{-19} \, \text{J} \)
• D. \( 2.48 \times 10^{-19} \, \text{J} \)

Hint:

Use $E = \frac{hc}{\lambda}$ to calculate photon energy. Convert wavelength to meters before substitution.