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Test 3

chapter 19

QuestionAnswer
An electric toothbrush completes 90 cycles every second. What are (a) its frequencies, and its (b) periods? a- 1/90 Hz b- 1/90 s
A wave is a periodic vibration in __________________. both space and time
What is the source of all waves? The source is something that is vibrating.
What is meant by the period of a pendulum? The time interval of a to-and-fro swing
Which has the longer period, a short or a long pendulum? The long pendulum has the longer period.
If the frequency of a particular wave is 20 Hz, its period is _________. 1/20 second
What is the frequency of vibration of the electron in the antenna of a station broadcasting at 101.7 MHz on the FM dial? 101.7 million vibrations per second
How does a sine curve describe a wave? A sine curve is a pictorial representation of a wave.
Distinguish between these different aspects of a wave: period, amplitude, wavelength, and frequency. Period is the time from one crest to the next, amplitude is the distance from the midpoint to a crest, wavelength is the distance from one crest to the next, and frequency is the number of crests that pass per second.
How are frequency and period related to each other? Frequency and period are reciprocals.
What travels in a wave from one location to another is _________. energy
Do the compressions and rarefactions of a longitudinal wave travel in the same or opposite directions? Both move in the same direction at the same time.
The vibrations along a transverse wave move in a direction _________. perpendicular to the wave
The vibrations along a longitudinal wave move in a direction _________. along and parallel to the wave
Sounds is transmitted by alternate compressions and rarefactions of air. What kind of wave is sound? Longitudinal wave
In one word, what is it that moves from source to receiver in wave motion? disturbance
Does the medium in which a wave travels move with the wave? No
Created by: marie112761
 

 



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