What impact do research and policies have on early childhood education? Head Start
Early Risers
American Society of Early Childhood Development
National Association for the Education of Young Children

Avoltaic cell converts chemical energy to

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?