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1. 1 The wavelengths of visible light range from about 380 nm to about 750 nm. (a) What is the range of photon energies (in eV) in visible light? (b) A typical FM radio station’s broadcast frequency is about 100 MHz. What is the energy of an FM photon of that frequency? Solution

2. 2 ( ) 1240 . 380 3.2631 (1) 1240 . 750 1.6533 (2) From (1) & (2), range of in visible light is from 1.6533 3.2631 . a E hf h p c c hc eV nm E nm eV hc eV nm E nm eV E eV to eV                     15 15 6 7 ( ) 4.136 10 . 100 4.136 10 . 100 10 4.136 10 b E hf X eV sX MHz X eV sX X Hz X eV       

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Visible Light Range.doc

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Visible Light Range.doc