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Radio stations identify themselves by their position on the radio dial such as 90.1 and 93.3. This number is based on the number of waves or cycles that pass a fixed point in a specific unit of time. To which property of a wave does this identification number refer? A. frequency B. wavelength C. loudness D. amplitude

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SinisterAce
The answer is A. 
Reason:The frequency of waves are determined by the amount of waves that pass a specific point in a certain period of time and Radio stations broadcast their signals at different frequencies so that the range of radio frequencies can be used by many stations.
okpalawalter8

The  property of a wave is given as frequency

What is the frequency?

Generally, Frequency is simply defined as the number of waves that pass through a fixed point in a given amount of time

In conclusion, for a number  based on the number of waves or cycles that pass a fixed point in a specific unit of time, we refer to it as frequency

Read more about frequency

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