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I am also unsure of which book edition you are referring to, but if your question is on the 7th Edition Topic 1A.3 exercise, then you would need to use the E=hv equation and the c=v*wavelength equation. For part (a), you would only need to use c+v*wavelength, yet remember that all electromagnetic radiation travels at the same speed of light, c. For part (b), you would need to use the equation c=v*wavelength again. For part (c), you would need to recognize that "the extent of change in the electrical field" is referring to wave amplitude and slope, therefore you would use the c=v*wavelength equation. For part (d), you must use the E=hv equation, while utilizing Planck's constant. Hope this helps!
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