Can anyone help with this? Thank you!

Question 1: A string, tied to a sinusoidal oscillator at P and running over a support at Q, is Oscillator stretched by a block of mass m. The separation L between P and Q is 1.50 m, and the frequency f of the oscillator is fixed at 125 Hz. The amplitude of the motion at P m is small enough for that point to be considered a node. A node also exists at Q. A standing wave appears (see figure) when the mass of the hanging block is 300 g. -1.1: What is the wavelength of this standing wave? -1.2: What is the speed of the individual waves that produce this standing wave? -1.3: For the same setup, the frequency is now variable, while the hanging mass stayed the same. What is the longest wavelength that produces a standing wave? What is the corresponding fundamental frequency