Problem 1: A sound wave of the form s = Smax cos(kx - wt+ 0) travels...
A sound wave of the form s = sm cos(kx - ωt + φ) travels at 343 m/s through air in a long horizontal tube. At one instant, air molecule A at x = 2.04 m is at its maximum positive displacement of 6.20 nm and air molecule B at x = 2.08 m is at a positive displacement of 2.00 nm. All the molecules between A and B are at intermediate displacements. What is the frequency of the wave?
A 72.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 72.0-Hz sound wave? Answer in nm
1. Use the equation yetar(x.0 - 2A cos(cos(x-ot +) to determine the initial displacement of the total wave when (a) ф-: 0 (b) ф з (c) ф-2 (d) ф :IT (e) ф-300"(f) ф-270" 2. (a) What is the relationship between sound level, energy, power and intensity? would the intensity of a sound heard by a listener be reduced if the listener moved three times further away from the source? 9 (b) By what proportion 3. For a standing wave on...
A 85.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 85.0-Hz sound wave?
t = 0 ms (a) (4 marks) A sinusoidal wave moving along a string is shown twice in the figure at time t = 0 (top) and time t = 4t (bottom). After At = 4.0 ms, the crest travels d=6.0 cm in the positive x direction. The equation for the wave is in the form 8 mm H HHHx y(x, t) =Ym sin(kx = wt). t = 4 ms What are (i) ym, (ii)k, (iii) w, and (iv) the...
4. The variation of pressure in a sound wave is described by the following function p-17 sin (6.50x-1 500t + π/2) Nm? where x is in meters and t is in seconds. (a) By comparing to the general form of the functions describing sound waves in Equation 1.6 and in Exercise 1.4, determine the amplitude of the pressure variations, the angular wave number, the angular frequency and the phase angle, giving the correct units for each. Determine (b) the amplitude...
how to solve it ? .47. The form of a sound wave travelling through air is S(x,t) = S" cos (kx + 3000t +の, where x is in meters and t in seconds. What is the shortest time interval that any air molecule takes along the path to move between displacements SS/ and SSm/3? (Ans: 0.23 ms)
If the form of a sound wave traveling through air is s(x, t) - (7.0 nm) cos (kx + (3024 rad/s)t + how much time does any given air molecule along the path take to move between
1. An experimenter wishes to generate in air a sound wave that has a displacement amplitude of 5.70 x 10-6 m. The pressure amplitude is to be limited to 0.850 Pa. What is the minimum wavelength the sound wave can have? (Take the equilibrium density of air to be p = 1.20 kg/m3 and assume the speed of sound in air is v = 343 m/s.) m 2. A sound wave in air has a pressure amplitude equal to 3.98...
If a sound wave moves at 333m/s calculate how far it travels in 23 ms (milliseconds). State your answer in metres. Answer 6 If a electromagnetic wave travels in vacuum at 3E8 m/s, calculate the time it takes to move 500-nm. State your answer in fs ed d out of Answer MacBook Air 名0 8