What are some factors that affect the frequency of sound

1. direction of propagation of sound

2.medium through which sound trsnsmitted

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

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid