Learning Goal:To understand the nature of a sound wave, including its properties:frequency, wavelength, loudness, pitch, and timbre.Sound is a phenomenon that we experience constantly in our everyday life.Therefore, it is important to understand the physical nature of a sound waveand its properties to correct common misconceptions about soundpropagation.Most generally, a sound wave is a longitudinal wave that propagates in amedium (i.e., air). The particles in the medium oscillate back and forth alongthe direction of motion of the wave. This displacement of the particlesgenerates a sequence of compressions and rarefactions of the medium.Thus, a sound wave can also be described in terms of pressure variationsthat travel through the medium. The pressure fluctuates at the samefrequency with which the particles' positions oscillate.When the human ear perceives sound, it recognizes a series of pressurefluctuations rather than displacements of individual air particles.Figurex(m)10-8V10-3t(s)2 of 2SubmitPart EThe next graph in (Figure 2) shows a sound wave consisting of a sinusoidal displacement of air particles versus time, as recorded at a fixed location. For sinusoidal waves, it ispossible to identify a specific frequency (rate of oscillation) and wavelength (distance in space corresponding to one complete cycle).Taking the speed of sound in air to be 344 m/s, what are the frequency f and the wavelength of the sound wave shown in the graph?Express your answers in, respectively, hertz and meters to three significant figures. Separate the two answers with a comma.► View Available Hint(s)17| ΑΣΦf₁ λ =SubmitPart FIt is perceived as higher in pitch.It is perceived as louder.It has a higher frequency.It has a longer wavelength.?A certain sound is recorded by a microphone. The same microphone then detects a second sound, which is identical to the first one except that the amplitude of the pressurefluctuations is larger. In addition to the larger amplitude, what distinguishes the second sound from the first one?► View Available Hint(s)SubmitHz, m Item 2Learning Goal:To understand the nature of a sound wave, including its properties:frequency, wavelength, loudness, pitch, and timbre.Sound is a phenomenon that we experience constantly in our everyday life.Therefore, it is important to understand the physical nature of a sound waveand its properties to correct common misconceptions about soundpropagation.Most generally, a sound wave is a longitudinal wave that propagates in amedium (i.e., air). The particles in the medium oscillate back and forth alongthe direction of motion of the wave. This displacement of the particlesgenerates a sequence of compressions and rarefactions of the medium.Thus, a sound wave can also be described in terms of pressure variationsthat travel through the medium. The pressure fluctuates at the samefrequency with which the particles' positions oscillate.When the human ear perceives sound, it recognizes a series of pressurefluctuations rather than displacements of individual air particles.FigureFWM0Aبا عمل سامB<C1 of 2 >Part ABased on the information presented in the introduction of this problem, what is a sound wave?O Propagation of sound particles that are different from the particles that comprise the mediumPropagation of energy that does not require a mediumPropagation of pressure fluctuations in a mediumO Propagation of energy that passes through empty spaces between the particles that comprise the mediumSubmitPart B Complete previous part(s)Part CDoes air play a role in the propagation of the human voice from one end of a lecture hall to the other?► View Available Hint(s)yesnoSubmitRequest AnswerPart DSubmit2 of 15ReviewThe graphs shown in (Figure 1) represent the entirety of three separate pressure variation vs time recordings by a microphone. Which could correspond to a sound wave?Enter the letters of all the correct answers in alphabetical order. Do not use commas. For example, if you think all three graphs could represent sound waves, enterABC.► View Available Hint(s)

Learning Goal: To understand the nature of a sound wave, including its properties: frequency, wavelength, loudness, pitch, and timbre Sound is a phenomenon that we experience constantly in our everyday life. Therefore, it is important to understand the physical nature of a sound wave and its properties to correct common misconceptions about sound propagation Most generally, a sound wave is a longitudinal wave that propagates in a medium (i.e., air). The particles in the medium oscillate back and forth along the direction of motion of the wave. This displacement of the particles generates a sequence of compressions and rarefactions of the medium. Thus, a sound wave can also be described in terms of pressure variations that travel through the medium. The pressure fluctuates at the same frequency with which the particles' positions oscillate When the human ear perceives sound, it recognizes a series of pressure. fluctuations rather than displacements of individual air particles Figure FIMM B 0 < 1 of 2 > A ▾ Part A Based on the information presented in the introduction of this problem, what is a sound wave? ▾ O Propagation of sound particles that are different from the particles that comprise the medium O Propagation of energy that does not require a medium O Propagation of pressure fluctuations in a medium O Propagation of energy that passes through empty spaces between the particles that comprise the medium Submit Part B Complete previous part(s) Part C Does air play a role in the propagation of the human voice from one end of a lecture hall to the other? ▸ View Available Hint(s) O yes O no Submit Request Answer Part D The graphs shown in (Eigure 1) represent the entirety of three separate pressure variation vs time recordings by a microphone. Which could correspond to a sound wave? Enter the letters of all the correct answers in alphabetical order. Do not use commas. For example, if you think all three graphs could represent sound waves, enter ABC. ▸ View Available Hint(s) Cubot