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An electromagnetic wave Y1, has a wavele...

An electromagnetic wave `Y_1`, has a wavelength 1 cm while other electromagnetic wave `Y_2` has a frequency of `10^15Hz`. Name these two types of waves and write one useful application for each.

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`Y_1` is microwave, use in radar communication.
`Y_2`: ultraviolet, ioize atom in atomsphere,
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