1. 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?
1. 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?
2. 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?
3. 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 × 10−14 J is required to trip the signal, what is the minimum number of photons that must strike the receptor?
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