Homework and Review Questions

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Presentation transcript:

Homework and Review Questions Sound Fundamentals Homework and Review Questions

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

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?

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?

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?

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?

Question #6 How does pressure relate to sound waves?

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

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

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

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?

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

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

Question #13 Distinguish between infrasound and ultrasound

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

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

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

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?

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