Chemistry Wavelength

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Chemistry Wavelength
Wavelength, frequency, and amplitude and energy. As a person in science, i should know the order of colours in the visible spectrum and the span of visible wavelengths. Question: if light is a .. Answer: max planck proposed that e.m radiation comes in units of defined energy rather than in any arbitrary quantities. Planck called it quantum The Photoelectric Effect Planck’s theories were used to explain a number of observations that had been troubling scientists. Einstein extended Planck’s ideas and suggested that each quanta of light behaves as a tiny particle called a __photon_ which has an energy E = h 1) it is said to be in an Excited state Finally, explaining the line spectrum: Bohr completed is model by making one more grand conclusion. He said that the electron could “jump” from one orbit to another by either emitting or absorbing photons with specific frequencies. Thus: • To move to a higher energy orbit ( a greater value of n) an electron must Absorb energy • To move to a lower energy orbit ( a lower value of n) an electron must Emit energy • The frequency of the absorbed or emitted energy corresponds to the energy difference between orbits, • Relationships between orbits: Concept check- how do u calcuate the energy difference between orbits? What is the physical meaning of calculating the energy required to promote an electron from m=1, n= infinity The greater the energy the smaller the wavelength de Broglie used the term matter waves to describe the wave-like properties of matter. With the regards to the atom, de Broglie concluded that an electron orbiting a nucleus could be thought of as a wave possessing a characteristic wavelength. Example. Calculate the wavelengths of the following objects. (a) a baseball weighing 142 g thrown at 142 km/h. (b) a helium atom moving at a speed of 8.5 x 105 m/s. The importance of the above example...... CH 5-2-3 The

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