How is a pitch that is heard when waves are closely spaced together described? A. the same as when waves are spaced far apart

B. high

C. low

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.