A stretched string has a fundamental frequency of 175 Hz. Discover the new frequency if you simultaneously do all of the following 3things: you increase the tension in the string by a factor of 4, and you double its length and you decrease the mass per unit length of the string by a factor of 9.
1. 175 Hz
2. 350 Hz
3. 525 Hz
4. 700 Hz
5. 1575 Hz