Grant is a College who loves to listen to very loud music. When is mother asks h
ID: 3521548 • Letter: G
Question
Grant is a College who loves to listen to very loud music. When is mother asks him to turn down the music down, Grant usually puts on his headphones instead of actually turning down the volume. During summer vacation Grant and his friends attended many concerts at the Hard Rock Café. One morning after an awesome concert, Grant did not wake up when his mother knocked on the door. He still did not wake up. Finally Grant opened the door when his mother clearly shrilled “Wake Up”. Grant told his Mom that he did not hear her knock, but did hear her yell. Did Grant really not hear her knock or was he just trying to get more sleep. Answer the Following Questions in order: Number each response.The submission must be in APA format. 1. The ear is composed of a series of transducers that convert air waves (vibrations) into nerve impulses that the brain interprets as sounds. (2pt) a. What is the amplitude of the sound wave that represents hearing? b. What is the frequency or the wavelength of the sound wave for human hearing?
Explanation / Answer
a. What is the amplitude of the sound wave that represents hearing?
Answer-
The amplitude also called the height of the sound wave, determines energy the contains and is perceived as loudness (the degree of sound volume). Larger waves are perceived as louder. Loudness is measured using the unit of relative loudness known as the decibel. Zero decibels represent the absolute threshold for human hearing, below which we cannot hear a sound. Each increase in 10 decibels represents a tenfold increase in the loudness of the sound (see Figure 4.29 “Sounds in Everyday Life”). The sound of a typical conversation (about 60 decibels) is 1,000 times louder than the sound of a faint whisper (30 decibels), whereas the sound of a jackhammer (130 decibels) is 10 billion times louder than the whisper.
b. What is the frequency or the wavelength of the sound wave for the human hearing?
Answer-
We can determine the wavelength from the frequency and/or the period if we have the wave velocity:
wavelength = period × velocity = velocity/ frequency
period of the lowest audible frequency, the lowest audible frequency is 20 Hz and has a period of 1/20 = 0.05 seconds.
period of the highest audible frequency, the highest frequency is 20,000 Hz and has a period of 1/20000 = 0.00005 seconds = 0.05 milliseconds.
shortest audible wave is the one with the highest frequency:
wavelength = velocity/frequency
= 340 m/s / 20000 1/s
= 0.017 m = 1.7 cm.
Longest audible sound wave, the longest audible wave is the one with the lowest frequency:
wavelength = 340/ 20 m, = 17 m.
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