PRELAB EXPERIMENT 7 1. A pipe that is shaped like a cone acts like a/an: (circle one) a) open pipe b) closed pipe c) both d) none of the above Calculate the fundamental frequency of long pipe open at both ends when: 2. Length of pipe = 1m, diameter = 2.54cm and velocity of sound = 344m/s a) 337.15Hz b) 200Hz c) 168.57Hz d) 161.50Hz 3. Length of pipe = 1.5m, diameter = 2cm and velocity of sound = 344m/s a) 212Hz b) 113.46Hz c) 100Hz d) 50Hz 4. Length of pipe = 2m, diameter = 3cm and velocity of sound = 344m/s a) 84.98Hz b) 50Hz c) 100Hz d) 45.68Hz Calculate the fundamental frequency of long pipe closed at one of the ends when: 5. Length of pipe = 1m, diameter = 2.54cm and velocity of sound = 344m/s a) 84.98Hz b) 85.14Hz c) 100Hz d) 45.68Hz 6. Length of pipe = 1.5m, diameter = 2cm and velocity of sound = 344m/s a) 84.98Hz a) 212Hz b) 113.46Hz d) 57.03Hz 7. Length of pipe = 2m, diameter = 3cm and velocity of sound = 344m/s a) 212Hz b) 113.46Hz c) 42.74Hz d) 45.68Hz 8. All these instruments exhibit the properties of a cone except. a) Saxophone b) Flute c) Trumpet d) None of the above 9. The vibration recipe of a closed pipe contains _________ harmonics a) Even numbered b) two c) odd numbered d) I don’t know 10. If the fundamental frequency of an open pipe is 20Hz, what is the frequency of the third mode of vibration a) 60Hz b) 100Hz c) 80Hz d) 150Hz 11. If the fundamental frequency of closed pipe is 20Hz, what is the frequency of the third mode of vibration a) 60Hz b) 100Hz c) 80Hz d) 150Hz 12. The vibration mode(s) of a closed pipe with respect to pressure of the wave starts with a ____ and ends with a _____ a) Node, Antinode b) Antinode, Node c) Node, Node d) Antinode, Antinode 13. The vibration mode(s) of an open pipe with respect to pressure of the wave starts with a ____ and ends with a _____ a) Node, Antinode b) Antinode, Node c) Node, Node d) Antinode, Antinode 14. Brass instruments are essentially __________ in shape a) Spherical b) circular c) cylindrical d) oval 15. Calculate the wavelength of the first mode of vibration of a closed pipe that has a length of 4cm. a. 0.16m b. 1.6cm c. 0.16cm d 1.6m 16. The experiment for this lab involves measuring _________ of an open and closed pipe. a) The speed of sound b) The frequency of the vibration modes c) frequency d) None of the above 17. How many resonant frequencies will be measured for both the open and closed pipe? a) 9 b) 2 c) 10 d) 7 18. These instruments will be used in performing the experiment for this lab except a) Oscilloscope b) meter rule c) Sound meter d) thermometer 19. The location of the pressure nodes and antinodes will be examined using what instrument. a) Sound meter b) microphone c) function generator d) movable piston 20. Why do we need a thermometer for this lab? a) To measure the room temperature b) To measure the temperature of the oscilloscope c) To measure the temperature of the function generator d) To measure the weather 21. Why is it advisable not to increase the voltage of the function generator in order to hear a sound with a frequency less than 250Hz? a) Your ear could go deaf b) The speaker could get damaged c) Noise pollution d) To prevent a fire outbreak in the lab 22. The function generator should be set to what initial frequency value before starting off with the experiment. a) 100Hz b) 200Hz c) 300Hz d) 250Hz 23. The resonant frequency should be recorded when the microphone signal is maximum. a) True b) False c) May be c) None of the above 24. _______ instrument displays the signal from the microphone a) Ruler b) Computer c) Oscilloscope d) Function generator 25. What is the wavelength when the distance between the antinode and node of a standing wave is d. a) d b) 0.5d c) 2d d) 4d
