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What is the number of vibrations that occur in a 1-second time interval.?
It is the frequency.
These seem to occur in eleven-year cycles?
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What is the number of vibrations that occur in a 1-second time interval is called?
It is called the frequency. The SI unit is the Hertz. One Hertz is one cycle per second.
The change that a given event will occur usually expressed between the number 0 will not and 1 the event will occur?
The chance that a given event will occur that is usually expressed between the numbers 0 and 1 is known as probability.
Solve problems in physics about waves?
It depends on what you mean by waves. However, the basic equation used in waves is: wavelength = velocity/frequency or in actual writing: λ = v/f The velocity, also known as speed, is pretty self explanatory. It is no different from "the measurement of a travelling object", except this is the measurement of a wave through its medium (if it has one). The frequency is the number of waves that occur or that pass a specified point, per unit time, usually recorded as a hertz or cycles per second. Easy? :D -A.L
