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it is a vibration :)
Back and forth in the direction of propagation of the sound waves.
it's called frequency. it can go up and down or back and forth
Yes.
Yes.
vibration
vibration
vibration
it is a vibration :)
Back and forth in the direction of propagation of the sound waves.
it's called frequency. it can go up and down or back and forth
turning back and forth down the slope
The back and forth movement of an object is called undulation, more commonly referred to as swaying or rocking. An object's undulation is measured in cycles (e.g. the number of times an object moves back and forth) per unit time. Ex. the undulation of a pendulum (such as in a grandfather clock) is usually measured in cycles per second.
The US and North Vietnam. US jets bombed the north; the north shot them down. (Back and forth; back and forth).
Yes.
packets
Yes.