The frequency of a given region of the electromagnetic spectrum is more than 3 x 10^19hz. note that the speed of light is 2.998 x 10^8 m/s. which waves are found in this region ?

To solve this problem, You need to look up a picture/diagram of the electromagnetic spectrum. This will have the wave regions listed as well as frequencies and wavelength.
Wavelength is distance/length of one wave, which can be calculated using frequency (hz = s^-1) and the speed of light.
2.998 x 10^8 m/s ÷ 3 x 10^19 s^-1 = 9.99 x 10^-12 m

The Frequency given falls in between X-rays and Gamma rays. The wavelength however; is in the Gama ray region.

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Sorry i dont understand the question can you rephase it?