Answer the questions

c) Frequency is the number of per second c) d) When a positive pulse collide with a negative pulse, they form interference e) Sound is a type of this mechanical wave (Transverse or Longitudinal?) A wave travels from a rope to a light string, its reflection is _ g) Speed of sound in air is depended on B ) 9. A standing wave is created by a 12-meter rope (hint: 2 fixed end), the speed of the wave is measured to be 36 m/s (e draw the standing wave patterns for the 1st and 3'd harmonic in the space below b ) Calculate the wavelengths of both of the waves in (a) C ) Determine the frequencies of both waves A1) 12 ) f1 ) (2 ) 10. a) label the nodes and antinodes on the diagram: b) What is its wavelength if the distance between nodes is 2 m? c) If the person is shaking her hand up-and-down 12 times per second, what is the wave velocity? Speed 11. Two tuning forks are sounded together. One tuning fork has a frequency of 256 Hz. An observer hears 15 beats in 5 seconds. What are the possible frequencies of the other tuning fork? Sketch the wave patterns associated with the 2nd harmonic of a flute (open-open) that is 52 cm cm long. What frequencies would these waves have if the flute was played at 17.0 .C? 13. While standing near a railroad crossing, a person hears a distant train horn. According to the train's engineer, the frequency emitted by the horn is 440 Hz. The train is traveling at 20.0 m/s and the speed of sound is 346 m/s. a) What would be the frequency of the train's horn if the train were at rest? b) What is the adjusted frequency that reaches the bystander as the train approaches the crossing? c) What is the adjusted frequency that reaches the bystander once the train has passed the crossing