Chapter 5: Quantum Chemistry 20. The AM station KBOR plays your favorite music f

Question

Chapter 5: Quantum Chemistry 20. The AM station KBOR plays your favorite music from the 20s and 30's at 1290 kHz. Find the wavelength of these waves. Your working out: 21. An infrared wave has a wavelength of6.5 x 10 cm. What is this distance in angstroms, Your working out: 22. A radio wave has a frequency of 8.6 x 108 Hz. What is the energy of one photon of this radiation? Your working out: 23. Infrared radiation from the sun has a wavelength of 6200 nm. Calculate the energy of one photon of that radiation. Your working out 24. Green light has a wavelength of 5200 A. Calculate the energy of one photon of green Your working out: 25. If the energy of a photon is 1.32 x 10 J, what is its wavelength in nm? Your working out 26. A photon has an energy of 5.53 x 10 J. What is its frequency in s Your working out: Page 4

Explanation / Answer

20. We know that

Speed of light=frequency ×wavelength

Wavelength=speed of light/frequency=

3×108m/s ÷1200×106Hz=0.25m=25cm

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