¿Cuál es la velocidad de un tren de ondas que se propaga con una frecuencia de 275 Hz y tiene

una longitud de onda de 0.95m?

261.25m/s

Explanation:

Velocity=frequency x wavelength

Velocity=275 x 0.95

Velocity=261.25m/s

half of a circle

explanation:

the arrow and the top of the circle is matching together. it is not a polygon because a polygon would always be the same shape. therefore, an half of a circle is called semicircle so you would find the radius of it.

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