Question

Why polices use high frequency whistles what will happen if they use low frequency whistles

Answer 1

people will not listen and ignore them and will run from there...who will break laws.

Answer 2

Police use high frequency whistles because of high frequency waves these waves go to a larger distance so that all the people will hear the sound of whistle. If they use low frequency whistles the waves go to a shorter distance and only less number of people will hear the sound.
Hope it is helpful.

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