pq14ans - 2 The electric field of a certain plane...

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PHYS-1200 PHYSICS II FALL 2004 Post Quiz 14 Name___________ ANSWERS _________________ 1. In an experiment like today's, you measure t 1 = 0.012 s, V 1 = 2.310 V, and V 2 = 2.97 V from the following graph. a) What is the frequency of this signal? There are four periods from 0 to t 1 . Then, T = t 1 / 4. f = 1/ T = 4/ t 1 = 4/0.012 s f = 333 Hz units b) What is the amplitude of this signal? V amp = ½( V 2 V 1 ) = ½(2.97 V – 2.31 V) V amp = 0.33 V units
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Unformatted text preview: 2. The electric field of a certain plane electromagnetic wave is given by ) sin( ∧ + + = x t ky E E The magnetic field is given by ∧ + + = z t ky B B ) sin( where ∧ ∧ y x and are unit vectors. In what direction is the wave propagating? (Circle the correct choice.) + x direction – x direction + y direction – y direction + z direction – z direction...
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