Physics 011

Quiz#12

# Chapter 12: Sound

 Chapter 12 Practice Problems

 1 A sound wave has a frequency of 1040 Hz. The air temperature is C. To the nearest tenth of a meter per second, what is the speed ? 2 To the nearest centimeter , what is the wavelength of the sound in problem 1)? 3 Two speakers are both emitting sounds ,the first with an intensity level of 1x10 w/m^2 and the second with an intensity of 1x10-10 w/m^2. What is the db level of the first? 4 What is the difference in the decibel (db) level of the two sounds in problem 3)? 5 What is the fundamental frequency (to the nearest Hz) of an open cm long organ pipe if the air temperature is 30 degrees Celsius? 6 In problem 5, what would be the correct answers if it were a closed organ pipe ? 7 The air temperature is 20 degrees Celsius and you are travelling at meters/sec toward a speaker emitting a sound at 1000Hz, which is travelling away from you at a speed of 30 meters/sec. To the nearest Hz, what is the frequency you hear? 8 In problem 7, what would be the answer if the speaker were travelling towards you?