In a standing wave, the positions with the highest amplitudes are the points of destructive interference wave troughs amplifications antinodes

In a standing wave, the positions with the highest amplitudes are ANTINODES

Explanation:

As we know that superposition of two waves which travels in opposite direction and is of same frequency will give the effect of maximum and minimum intensity at alternative points

this phenomenon of wave superposition is known as standing waves

so here in standing waves the points of constructive interference is known as Antinodes where the amplitude of the wave is maximum and hence the intensity will be maximum

And all the points where it will form destructive interference is known as Nodes and here at all nodes the amplitude is minimum and the hence the intensity is also minimum

at antinodes

at nodes

b.

explanation:

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.