Decibel levels represent the amount of energy producing the pressure of the vibrations we perceive as sound. Which of these is an accurate description of this perceptual process?
a) The greater the hertz, the lower the pitch.
b) The greater the hertz, the higher the pitch.
c) The greater the pressure, the less intense the vibration.
d) The greater the pressure, the more intense the vibration.
ANS: d
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What type of glial cells myelinate axons in the brain and spinal cord?
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Which math strategy involves starting with the larger addend and then counting up from there to obtain the sum?
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a. 2 days c. 1 week b. 2 weeks d. 1 day