As the energy of a wave increases its increase
a- wavelength
b- frequency
c-amplitude
an object to be located by sonar can be assumed to be farther away when the echo takes a time to return
a-longer
b- shorter
( answer both)

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions