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You do not need to fully memorize the electromagnetic spectrum but it may be helpful to know that visible red light is about 700nm and visible violet light is about 400nm because that was covered in lecture.
My TA said it would be good to know the rough wavelength range. Visible light wavelength range from 400nm (violet) to 700nm (red) is pretty important. Then remember the wavelength from small to large: x-ray and gamma-ray < UV < visible < IR < microwave/radiowaves. Remember the range for UV (350nm) and IR (1000nm). Table1.1 in textbook is a really good and important reference!
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