The energy E of a photon and it's wavelength are related by Eλ = X. the numerical value of X is? [h = 6.63 x 10-34js, c = 3 x 108 ms-1]

Answer Details

The equation Eλ = X relates the energy E of a photon to its wavelength λ. The value of X can be found by substituting the given values for Planck's constant (h) and the speed of light (c) in the equation. Using the given values, X = hc = (6.63 x 10^-34 J s) x (3 x 10^8 m/s) = 1.99 x 10^-25 J m. Therefore, the correct option is 1.99 x 10-25.