Natasha holds the two ends of a string in her hands and then moves her hands up and down so that a wave travels from one end of the string to the other end. in which case will she have a standing wave along the string?
a. the resultant wave rises and falls in amplitude over time and has a frequency equal to that of the waves.
b. the resultant wave has a fixed amplitude and a frequency twice that of the waves.
c. the resultant wave has a fixed amplitude and a frequency equal to that of the waves.
d. the resultant wave rises and falls in amplitude over time and has a frequency twice that of the waves.
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