1. Homework and Review Questions
Sound Fundamentals
Homework and Review Questions

2. Question #1
The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 27°C

3. Question #2
A group of hikers hear an echo 3.00 s after they shout. If the temperature is 22°C, how far away is the mountain?

4. Question #3
A sound of a pin dropping achieves an intensity of 10dB. The sound of a violin played at a concert is 70dB. The sound of a commercial jet taking off the runway measures about 150dB. How many times louder than the pin drop is the violin? How many times louder is the airplane?

5. Question #4
A noisy machine in a factory produces a decibel rating of 80 dB. How many identical machines could you add to the factory without exceeding the 90 dB limit?

6. Question #5
In north America, one of the hottest outdoor temperatures ever recorded is 57°C and one of the coldest is -67°C. What is the difference in the speed of sound at those temperatures?

7. Question #6
How does pressure relate to sound waves?

8. Question #7
How do the sound waves in air get translated into electricity?

9. Question #8 What does pitch mean?
What is the range of audible sounds for the average human?

10. Question #9
Explain why you can hear people speaking around the corner of an open doorway but not see them

11. Question #10 The Speed of sound in air is about
340 m/s. What is the wavelength of a sound wave with a frequency of 275 Hz?

12. Question #11
Identify 2 factors that may affect the speed of sound.

13. Question #12
Explain why sound travels faster in water than air

14. Question #13
Distinguish between infrasound and ultrasound

15. Question #14
Determine which of the following must change when the pitch gets higher:
Amplitude
Frequency
Wavelength
Speed
Intensity

16. Question #15
Question #5, Determine which of the following must change when the sound gets louder
Amplitude
Frequency
Wavelength
Pitch
Speed

17. Question #16
Why are sonograms made with ultrasound waves instead of audible sound waves?

18. Question #17
Janet is standing 58.2 m from Ninovan. If Ninovan shouts, how long will it take Janet to hear her? Uses 343 m/s for the speed of sound?

19. Question #18 Determine the average decibel level that describes the loudness of each sound shown below
B WHISPERING
C Vacuum
A TALKING
E Airplane takeoff
D Lawn Mowers