Please help with all questions and the letter choice they are

Question 1 1 pts A string of mass 8 g and length 0.66 m long is clamped at both ends and placed under some unknown tension. The string vibrates at 300 Hz in its third harmonic. What is the wavelength of the standing wave in the string? 8 cm 44 cm 73 cm O 2 cm Question 2 1 pts A string is tightly clamped at both ends. Its length is 0.85 m. If the lowest standing wave frequency of the string is 120 Hz, how fast do waves travel on this string? O 95 Hz 616 Hz 18 Hz 204 m/s Question 3 1 pts If a wave has a speed of 130 m/s and a period of 2.5 ms, what is its wavelength? O 52 m O 0.37 m O 4.6 m 118 m Question 4 1 pts An object is undergoing simple harmonic motion of amplitude 1.8 m. If the maximum velocity of the object is 7 m/s, what is the object's angular frequency? O 7.8 rad/s O 0.17 rad/s 3.9 rad/s 1.45 rad/s