1. Things to remember… Calculating wavelength and frequency: C = λν where c = 3.00 x 10 8 m/s Energy per photon: E = hν where h = 6.626 x 10 -34 J ∙s photon Pay attention to units ! Hz = s -1 1 m = 10 9 nm

2. What is the frequency of radiation which has a wavelength of 7.00 x 10 -5 cm? In what region of the electromagnetic spectrum is this radiation?

3. What is the wavelength of the electromagnetic radiation whose frequency is 1.5 x 10 13 Hz? Does this radiation have a longer of shorter wavelength than red light?

4. What is the energy of a photon of red light with a frequency of 4.29 x 10 14 Hz?

5. A dental hygienist uses x-rays (λ = 1.00 Å) to take a series of dental radiographs while the patient listens to a radio station (λ = 473 nm). What is the frequency (in s -1 ) of the electromagnetic radiation from each source? (1 Å = 10 -10 m)