Which is the best description of a sound wave when the pitch of the sound is very high?

A.
The particles have a lot of potential energy.

B.
The temperature of the sound increases.

C.
The particles are vibrating very fast.

D.
The waves are moving in only one direction.

para mi es la AA

Explanation:altura, o altura tonal, indica si el sonido es grave, agudo o medio, y viene determinada por la frecuencia fundamental de las ondas sonoras, medida en ciclos por segundo o hercios (Hz). vibración lenta = baja frecuencia = sonido grave. vibración rápida = alta frecuencia = sonido agudo.

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native americans suffered high rates of poverty and unemployment.

during the late 1960s and early 1970sthe need for political militancy grew among the native americans. throughout the 1960s, they had been the nation's poorest minority group, the most deprived group, according to practically every socioeconomic measure. in 1970, the indian unemployment rate was 10 times the national average, and 40 percent of the native american people were below the poverty line.