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Starter Question

Starter Question. Answer the following questions. What has a higher frequency, yellow light or blue light? What has a longer wavelength, gamma rays or x-rays? What has more energy, FM radio or visible light? Calculate the wavelength of red light if its frequency is

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Starter Question

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  1. Starter Question • Answer the following questions. • What has a higher frequency, yellow light or blue light? • What has a longer wavelength, gamma rays or x-rays? • What has more energy, FM radio or visible light? • Calculate the wavelength of red light if its frequency is • 4.29x1014 Hz. Express your answer in nm c = λν 3x108 = λ x 4.29x1034 λ = 699nm

  2. Niels Bohr • Danish physicist • Worked with Thompson and Rutherford • Worked on the Manhattan project • His son also won a Nobel prize for physics

  3. The Bhor Model of the Atom Hydrogen is used because it has the simplest picture It only has one electron The one electron in hydrogen occupies the energy level closest to the nucleus most of the time However if the electron is excited, it can occupy one of the other energy levels. When the electron returns to the first energy level it releases energy. This energy is related to an area of the EMS.

  4. Use the copy of this diagram on your desk and the databooklet to show the different spectral lines

  5. Atomic Emmision Spectra These are formed by the transition of electrons between energy levels. Because there is a set gap between the energy levels, the lines on the spectrum appear at specific wavelengths. This means that each element has a specific spectra, much like a finger print

  6. Why do different elements have lines at different wavelengths?

  7. Questions • Look at the spectrum above and determine the colors of the four visible lines in the hydrogen spectrum . • 410nm • 432nm • 486nm • 656nm purple purple blue red

  8. The diagram on the right shows only four of the many possible energy levels around the nucleus of an atom. • Draw arrows between the energy levels for all possible energy transitions fro this atom • How many spectral lines will this atom produce from these energy levels? • Which transition will give you the highest frequency of light? • Which transition will give you the longest wavelength of light? 6 n=4 → n=1 n=4 → n=3

  9. Complete the worksheet and hand it in at the end of the lesson. Remember to answer in sentances. You should answer the questions on a separate piece of paper.

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