Q11. Find out what the frequency of the musical note A4 is and report your finding here. What is the frequency of the musical note A3?

Q12. The speed of sound in air is about 343 m/s. Convert this into miles per hour and into kilometers per hour.

Q13. Calculate the wavelength of the musical note A4 using your answer from Q11 and a speed of sound in air of 343 m/s.

Q14. The length of a guitar's strings is 650 mm. What is therefore the wavelength of a wave on any of the strings if the string is free to move?

Q15. Using your answers from Q11 and Q14, calculate the wave speed on the A4 string of a guitar. What is the wave speed on the A3 string of a guitar?

Q16. You hear your brother playing the guitar in his room at the end of the hall way, 8 m away from you. How long does the sound take to travel from his guitar to your ear?

Q17. Does the amplitude of a wave change its frequency?