Sound Frequency in C....Dangerous effects of high sound frequency

int i;
for(i=1;1<=20000;i++)
{
sound(i);
delay(20);
}

This created continuesly increasing sound. Before the programe could

end,I stopped it by running the program with nosound(); function in

it.

I am not a developer but a student in X Standard (15 yrs old).
I would like to ask, Can the internal speaker create such high

frequency sound waves? If Yes, what's its limit and can it anyway harm

us? I aksed my biology teacher about this, she said that high

frequency sound waves can change the sructure of our DNA. So my main

question are: can a C programe create such sounds? Can the internal

CPU speaker create such sounds? Can these sounds prrove to be harmful

to us?

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