How to find the solution?

Question

Microwave ovens emit microwave energy with a wavelength of 12.6 cm. What is the energy of exactly one photon of this microwave radiation?

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Answer 1

E = hc/λ

E = energy of one photon = ?

h = Planck's constant = 6.626x10^-34 Js

c = speed of light = 3x10⁸ m/s

λ = wavelength in meters = 12.6 cm x 1 m / 100 cm = 0.126 m

E = (6.626x10^-34 Js)(3x10⁸ m/s) / 0.126 m

E = 1.58x10^-24 J