# 6_EC_Key_2019.docx - Chapter 6 Extra Credit Worksheet Name...

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Chapter 6 Extra Credit Worksheet Name: ______________________________ 1. An FM radio station found at 103.1 on the FM dial broadcasts at a frequency of 1.031 ×10 8 s −1 (103.1 MHz). What is the wavelength of these radio waves in meters? 2.91 m 2. A bright violet line occurs at 435.8 nm in the emission spectrum of mercury vapor. What is the frequency of this light? 6.88 x 10 14 1/s
3. Light with a wavelength of 614.5 nm looks orange. What is the energy, in joules, per photon of this orange light? 3.23 x 10 -19 J 4. When rubidium ions are heated to a high temperature, two lines are observed in its line spectrum at wavelengths (a) 7.9 × 10 −7 m and (b) 4.2 × 10 −7 m. What are the frequencies of the two lines? What color do we see when we heat a rubidium compound? (a) 3.8 x 10 14 1/s blue or purple 5. One of the radiographic devices used in a dentist's office emits an X-ray of wavelength 2.090 × 10 −11 m. What is frequency of this X-ray? 1.44 x 10 19 1/s
6. The eyes of certain reptiles pass a single visual signal to the brain when the visual receptors are struck by photons of a wavelength of 850 nm. If a total energy of 3.15 × 10

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