Final answer:
Using Planck's equation, the energy of one photon from a microwave oven with a wavelength of about 120 mm is found to be a)1.66 x 10^-25 joules.
Step-by-step explanation:
The student has asked how many joules there are in one photon of energy from a microwave oven with a wavelength of about 120 mm. To answer this question, we need to use the relationship between the energy (E) of a photon and its wavelength (λ), given by Planck's equation E = hc/λ, where h is Planck's constant (6.626 x 10-34 J·s) and c is the speed of light (3 x 108 m/s). Plugging in the given wavelength (0.12 m) and constants, we find the energy of one photon.
E = (6.626 x 10-34 J·s)(3 x 108 m/s) / (0.12 m) = 1.66 x 10-25 J
Therefore, the correct answer is (a) 1.66 x 10-25 J.