Having trouble with 2 questions. A. Calculate the energy of a photon emitted whe

Question

Having trouble with 2 questions.

A.

Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 5 to n = 1..

B.

A container with 0.149 L of water is placed into microwave and is then radiated with electromagnetic energy that has a wavelength of 14.5 cm. The temperature of the water then rose by 89.7 °C. Calculate the number of photons that were absorbed by the water. Assume water has a density of 1.00 g·mL–1 and its specific heat is 4.184 J·g–1·°C–1

Explanation / Answer

For A) use the following expression:

v = RH (1/n12 - 1/n22)

delta E = hcv so replacing both equations:

delta E = hcRH(1/n12 - 1/n22)

delta E = 6.63x10-34 * 3x108 * 1.097x107 (1/1 - 1/52)

delta E = 2.18x10-18 (0.96)

delta E = 2.0928x10-18 J

Part B I have a doubt, so I answer til here. Post part B in another question thread. Hope this helps.

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