18. please help

Standing Wave Patterns in Air Columns 1. An open-end air column has a length of 20 cm. The wavelength of the first harmonic is 10 cm. 2. If a closed-end air column has a fundamental frequency of 200 Hz, then the frequency of the fourth harmonic is 800 Hz 3. An open end of an air column allows air to vibrate a maximum amount whereas a closed end forces air particles to behave as nodes, 4. Open-end air columns have antinodes positioned at each end while closed-end air columns have nodes positioned at each end. 5. The pitch of a sound can be increased by shortening the length of the air resonating inside of an alr column. 6. The speed of sound in air is 340 m/s. A closed-end air column has a length of 40 cm. The fundamental frequency of this air column is approximately 213 Hz. 18. Which of the statements are TRUE of the harmonics and standing wave patterns in air columns? Answer in numerical order. (Record your answer in the numerical-response section below) Your