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Users can click any phrase to repeat it as needed. Users can also download audio files (MP3) containing one or two languages. There are no pauses in the audio files to listen and repeat, so learners need to speak along with the recording (shadowing). [8] [9] In the app, learners can record their own voice for comparison with the recorded voice.
Six Easy Pieces (paperback book) ISBN 0-201-40825-2; Six Not-So-Easy Pieces (paperback book with original Feynman audio on CDs) ISBN 0-201-32841-0; Six Not-So-Easy Pieces (paperback book) ISBN 0-201-32842-9; Exercises for the Feynman Lectures (paperback book) ISBN 2-35648-789-1 (out of print) Feynman R, Leighton R, and Sands M.
Among the textbooks published after Jackson's book, Julian Schwinger's 1970s lecture notes is a mentionable book first published in 1998 posthumously. Due to the domination of Jackson's textbook in graduate physics education, even physicists like Schwinger became frustrated competing with Jackson and because of this, the publication of ...
Most objects do not reflect or transmit light specularly and to some degree scatters the incoming light, which is called glossiness. Surface scatterance is caused by the surface roughness of the reflecting surfaces, and internal scatterance is caused by the difference of refractive index between the particles and medium inside the object.
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In the late 17th century, Sir Isaac Newton had advocated that light was corpuscular (particulate), but Christiaan Huygens took an opposing wave description. While Newton had favored a particle approach, he was the first to attempt to reconcile both wave and particle theories of light, and the only one in his time to consider both, thereby anticipating modern wave-particle duality.
[1] [2] Soon the term referred to a plot of light intensity or power as a function of frequency or wavelength, also known as a spectral density plot. Later it expanded to apply to other waves , such as sound waves and sea waves that could also be measured as a function of frequency (e.g., noise spectrum , sea wave spectrum ).
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