Plz explain your answer

a guitar string has a length of 0.90 m. when you pluck it, it plays a “c” that has a frequency of 256 hz. how fast is the wave moving back and forth along the string?

460.8 m/s

Explanation:

The equation that relates fundamental frequency, wavelength and speed of a standing wave on a string is

where

f is the frequency

v is the speed of the wave

L is the length of the string

in this problem, we have

f = 256 Hz is the frequency

L = 0.90 m is the length of the string

Therefore, re-arranging the equation we can find the speed of the wave:

answer: b.

explanation:

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer