1. In 1974, IBM researchers announced that X rays with a wavelengthof only 0.154

Question

1. In 1974, IBM researchers announced that X rays with a wavelengthof only 0.154 nm had been guided through a "light pipe" similar tooptic fibers used for visible and near-infrared light. Calculatethe energy of one of these X-ray photons.

2. Wireless "cable" television uses radio waves having frequenciesclose to 28 GHz to transmit images. Find the energy of a photon atthis frequency.

3. Consider an electromagnetic wave that has a wavelength equal to92 cm, a length that corresponds to the longest ear of corn grownto date. What is the frequency corresponding to this wavelength?What is its photon energy? Express the answer in joules and inelectron-volts.



I am sooo lost. Please help...

Explanation / Answer

1. E=hf or E= h c/ h- Plank's constant h=6.626× 1034Js   or h=4.135× 1015 eV s - now just compute   E= h c/ E= 6.626× 1034 x2.99x108 /1.54x10-10 =   (in J)or E=4.135× 1015 x2.99x108 /1.54x10-10 = (in eV) - 2.  E=hf 3.  a)What is the frequency corresponding to thiswavelength? f=c/ b)What is its photon energy? Express the answer in joules andin electron-volts. E= h f Please let me know if you have any questions.

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