Microwave ovens emit microwave energy with a wavelength of 12.9 cm. What is the energy of exactly one photon of this microwave radiation?

Answer 1

E = hc / λ

E = energy of 1 photon = ?

h = Planks constant = 6.626x10^-34 Jsec

c = speed of light = 3x10⁸ m/sec

λ = wavelength in meters = 12.9 cm x 1 m / 100 cm = 0.129 m

E = (6.626x10^-34 Jsec)(3x10⁸ m/sec) / 0.129 m

E = 1.54x10^-24 J