Which condition is necessary for a standing wave?
a) two interfering waves of the same frequency must travel in opposite directions
b) two interfering waves of the same frequency must travel in the same direction
c) two interfering waves of the same amplitude must travel at right angles to each other
d) two interfering waves of the same amplitude must travel in the same direction

Marcella is a four-year-old girl who is a victim of emotional child abuse. based on the child and family services improvement and innovation act of 2011, which action should the government take for marcella? a. the state should arrest marcella’s abuser. b. the state should find a home for marcella as soon as possible. c. the state should enforce stricter laws in the area where marcella resides. d. the state should provide medical assistance to marcella.

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?