Round the number 45.998 to three significant figueres

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

Sound is a disturbance that travels through a medium as a

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?