A string is tied down at both ends. Some of the standing waves on this string have the following frequencies: 100Hz, 200Hz, 250Hz, and 300Hz. It is also known that there are no standing waves with frequencies between 250Hz and 300Hz.

What is the fundamental frequency of this string?

What is the frequency of the third harmonic?

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.