(a) If the kinetic energy of an electron and the energy of a photon are both \(2.00 \times 10^{-18} \mathrm{~J}\), calculate the ratio of the de Broglie wavelength of the electron to the wavelength of the photon. Which particle has the shorter wavelength?

(b) If the wavelength of a photon and the de Broglie wavelength of an electron are both \(250 \mathrm{~nm}\), calculate the ratio of the energy of the photon to the kinetic energy of the electron. Which particle has greater energy?