(Figure 1) shows a standing wave on a 1.5-m-long string that has been fixed at both ends and tightened until the wave speed is 50 m/s . Figure 1 of 1 A standing wave oscillates on a string tied between two vertical walls. The standing wave has four antinodes and five nodes, including the nodes at the ends of the string. Part A What is the frequency? Express your answer with the appropriate units. View Available Hint(s) for Part A Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value type Activate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type