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A ______ is a back and forth motion that repeats itself. 

 ____ when the frequency of an external force matches the natural frequency and standing waves are set up

Through which medium will sound travel most rapidly? 

____  apparent increase in volume caused by reflections, usually arriving within 0.1 second after the original sound

The number of vibrations that occur in 1 second is called 

_____  a change in the direction of travel of light, sound, or other waves crossing a boundary

What is labeled 9 below? A. Metals    B. Alkali Metals   C. Halogens    D. Atomic weight     E. Period     AB. Noble Gases    AC. Alkaline Earth Metals       AD. Transition Elements       AE. Semiconductors   BC. Nonmetals   BD. Atomic number   BE. Periodic Table      

What is labeled 7 below? A. Metals    B. Alkali Metals   C. Halogens    D. Atomic weight     E. Period     AB. Noble Gases    AC. Alkaline Earth Metals       AD. Transition Elements       AE. Semiconductors   BC. Nonmetals   BD. Atomic number   BE. Periodic Table      

What is labeled 4 below? A. Metals    B. Alkali Metals   C. Halogens    D. Atomic weight     E. Period     AB. Noble Gases    AC. Alkaline Earth Metals       AD. Transition Elements       AE. Semiconductors   BC. Nonmetals   BD. Atomic number   BE. Periodic Table      

What is labeled 11 below? A. Metals    B. Alkali Metals   C. Halogens    D. Atomic weight     E. Period     AB. Noble Gases    AC. Alkaline Earth Metals       AD. Transition Elements       AE. Semiconductors   BC. Nonmetals   BD. Atomic number   BE. Periodic Table