A sinusoidal wave is sent along a cord under tension, transportingenergy at the average rate of Pavg,1.Two waves, identical to thatfirst one, are then to be sent along the cord with a phase differencef of either 0, 0.2 wavelength, or 0.5 wavelength. (a) With only mentalcalculation, rank those choices of f according to the averagerate at which the waves will transport energy, greatest first. (b) Forthe first choice of f, what is the average rate in terms of Pavg,1?8 (a) If a standing wave on a string is given byy(t) = (3 mm) sin(5x) cos(4t),is there a node or an antinode of the oscillations of the string atx = 0? (b) If the standing wave is given byy(t) = (3 mm) sin(5x + p/2) cos(4t),is there a node or an antinode at x = 0?

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Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.