1. which of the following is true? 2. Which of the following is true? When pulse

Question

1. which of the following is true?

2. Which of the following is true?

When pulses encounter one another on the string they merge briefly and then reflect back the way they came. When pulses encounter one another on the string they merge briefly and then continue on as if they had never met. When a pulse reflects from a free end of a string, the maximum displacement of the free end is equal to the maximum amplitude of the pulse. A pulse encountering a fixed end is reflected so it returns upright, while a pulse reflecting from a free end is inverted. A pulse encountering a free end is reflected so it returns upright, while a pulse reflecting from a fixed end is inverted.

Explanation / Answer

5. Two waves are generated on a string of length 3.0 m to produce a three-loop standing wave with an amplitude of 4.6 cm. The wave speed is 123 m/s. Let the equation for one of the waves be of the form y(x, t) =ym sin (kx + ?t). In the equation for the other wave, what are (a)ym, (b)k,(c)?, and (d) the sign in front of ? (1 depicts "+" and 0 depicts "-"

Ym= 0.702 cm /2=0.351 cm

V=31.2 ? /? /6=187.2 cm/s

D=delta/s= 2pie /2k= 6 cm

U=delta y/ delta t= --31.2 ? x 0.702 sin ( pie /6 x2.1) sin (31.2 ? x 1.7)=36 cm/s

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