The loudness of sound is determined by the of vibration

The loudness of sound is determined by Amplitude of Vibration.

Explanation:

Louder Sound waves have higher amplitude(more energy and reach at far distances),Softer Sound have less amplitude.

Amplitude : The maximum disturbance of vibrating particle from their mean position.(/the height of peak)

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

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete