Make a sketch on a graph which shows what a 30kHz sine wave with an amplitude of 1V would look like on a scope with settings of 0.2V/div and 10

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Oscilloscope trigger problem. The 'trigger' settings determinewhenthe trace begins. Suppose you have displayed a sine wave with V=Vosin(Ït) on the screen, where Vo=4Vand Ï/2Ï=5kHz. Assume furtherthat thesignal triggers the scope when V=2V andÏt=30 degrees.
EXAMPLE:
Suppose you double the amplitude of the wave without changinganyoscilloscope settings. What are V andÏt now when the scope istriggered? [Answer: thelevel hasn't changed so the scope stilltriggers whenV=2V.V=2=8sin(Ït); Ït=sinâ1(2/8)=14.4775121851511degrees.]
QUESTION:
Assume that you reduce Vo back to 4 V and switch thetrigger slopepolarity from '+' to '-' without changing the triggerlevel dial.What are V and Ït when the scope is triggerednow?
Volts,
degrees

1. One ofthe strings of a guitarlies along the x-axis when in equilibrium.The end of thestring is at x=0 (the bridge of the guitar) is tieddown. Anincident sine wave travels along the string in the xdirection at143 m/s with an amplitude of 0.750 mm and a frequencyof 440Hz. This forms a standing wave.

a) Find the equation givingthedisplacement of a point on the string as a function of positionandtime. (3 points)

b) Locate the points on the string thatdonât moveat all. (1 point)

c) Locate the points of maximumdisplacementfrom equilibrium. (1 point)

A string carries a sinusoidal wave with an amplitude of 2.0 cm and a frequency of 100 Hz. What is the maximum speed of any point on the string?

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Make a sketch on a graph which shows what a 30kHz sine wave with an amplitude of 1V would look like on a scope with settings of 0.2V/div and 10

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Physics: Principles with Applications

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