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I have to pass physics.

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
show incident and reflected pulses are created with periodic frequency; appears stationary  
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node   show
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show largest amplitude; 1/2 way between nodes  
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show frequencies below 20 Hz  
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show frequencies above 20,000 Hz  
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Pitch   show
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show 3-D distribution of waves (a sphere)  
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Plane waves   show
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timbre   show
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show 12 note scale; 13th note is twice 1st notes frequency  
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show periodic variation in amplitude of sound wave that is the superposition of two waves of slightly different frequencies  
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beat frequency   show
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show max displacement from equilibrium  
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show distance between identical positions on consecutive waves  
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show number of waves passing a fixed point per unit time  
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period   show
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wave   show
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medium   show
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show one that requires a medium to travel through  
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show doesn't require a medium  
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pulse wave   show
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show wave made of periodic and continuing pulses  
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simple harmonic motion   show
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transverse wave   show
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longitudinal wave   show
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show vibration caused by resonance; starts vibrating because of the waves of second object  
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resonance   show
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show lowest frequency of vibration of a standing wave; also called 1st harmonic  
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harmonics   show
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intensity   show
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threshold of hearing   show
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Threshold of pain   show
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show intensity of wave divided by intensity of threshold of hearing  
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decibel level   show
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show high density/peak  
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show low density/trough  
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wave speed   show
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show amplitude of a wave diminishes over time due to energy loss  
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show combination of two overlapping waves  
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interference   show
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show two waves add in same direction  
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show two waves subtract due to a + and - amplitude  
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reflection interaction   show
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