Answer
a. A photon from the TV transmitter has a greater wavelength.
b. A photon from the ultraviolet lamp has the greater energy.
c. A photon from the ultraviolet lamp has the greater frequency.
d. A photon from the ultraviolet lamp has the greater momentum.
Work Step by Step
a. As seen in Figure 26.3, TV/radio electromagnetic waves have much longer wavelengths than ultraviolet waves.
b, c. The speed of electromagnetic waves equals frequency multiplied by wavelength. Ultraviolet has a shorter wavelength and thus a higher frequency f. For photons, E = hf, so uv photons have more energy per photon.
d. The momentum of a photon is E/c, so the higher-energy uv photon also has grater momentum. (This formula will be learned in a later physics class.)
