Standing Waves Lab

-“The wavelength is 0.20 s.” This is wrong because wavelength’s unit is meter and it measures the distance between two adjacent locations in the disturbance, not the time one particle takes to finish one vibration.

As the distance to an object is determined by measuring the time of flight and not by the intensity of the sound, ultrasonic sensors are excellent at suppressing background interference. Virtually all materials which reflect sound can be detected, regardless of their color. Even transparent materials or thin foils represent no problem for an ultrasonic

The purpose of this experiment is to measure the speed of sound in air and to determine the effects of frequency on the speed of sound.

Change the amplitude to 0.75cm and change frequency back to 1.50Hz. Pause the wave again. Does this change the distance between crests? Is the overall wavelength the same as before?

P=P_1 +C_p*(V-V_0 ) [9] where P and P1 are the measured and atmospheric pressures in psia, Cp is the calibration constant in psia/volts, V is the transducer voltage, and V0 is the offset voltage. RESULTS AND DISCUSSION To convert the measured voltages to pressures, we first determined the calibration constants of transducers 2 and 3 for each of the trials ranging from 6 to 14 psig. To do this, we calculated the measured shock wave velocity for each trial by dividing the distance between transducers 2 and 3 (0.548 m) by the measured time difference between the peak measured voltages. Next, assuming T = 70° F and γ = 1.4 (for air), we calculated the speed of sound and Mach number using equations 2 and 3.

the speed of sound is much smaller than the speed of light. Ans: Given statement is true because a dimensionless quantity can be large or small only in comparison to some standard or reference. We can’t say that given dimensionless quantity is large or small without comparing it to some other quantity (or with some reference).For example angle is a dimensionless quantity. ∠ = 60o is a very large angle but in comparison to ∠ = 90o

An Ultrasound Technician, also known as diagnostic medical sonographers, use high-frequency sound waves to create images of soft tissue in a patient's body. Physicians use these images to diagnose abnormalities and diseases in a patient. As early as 1826, a Swiss physicist name Jean-Daniel, had effectively used an underwater bell to determine the speed of sound in the waters of Lake Geneva. In the late 1800s, physicists were working successfully towards defining the fundamental physicists of sound waves, transmission, propagation, and refraction. Lord Rayleigh was the first to describe sound waves as a mathematical equation, forming the basis of future practical work in acoustics. Lord Rayleigh famous work “the Theory of Sound” was published

with two or more circulating waves such as those shown in Figs. 2(a) (multimedia view) and 2(e) (multimedia view)

Burt Stephens 01-15-2015 Super Senses Purpose: The purpose of this lab is to tune your senses of sight and sound. Introduction: Sound is created when energy travels as waves of pressure through matter such as air, water, or even solid materials. Virtually everything that vibrates can yield sound. When something oscillates it pushes the particles around it, and those particles in turn push the air particles around them, moving the pulse of the vibration in all directions from the source.

This paper demonstrates the existence of standing sound waves and superpositional wave interference in single-side open tubes through measurement using a microphone. Relations used in modeling are given and referenced consistently throughout the paper. The measurement data supports the conclusion in a clear manner.

These averages we determined from the trials can be compared to the accepted speed of sound (344.2 m/s in this specific temperature), and we determine the relative error percentages:

In this picture, I am plucking a chord on a violin. This is an example of simple harmonics and waves. The chords on a violin, or any stringed instrument, act as strings that are fixed at both ends. The vibration on the string, which was caused by me plucking it, is known as a standing wave, meaning it has nodes at both ends. The nodes are clearly seen as places where the amplitude is always zero. The antinodes are where the amplitude varies from zero to the maximum value. The first harmonic, or fundamental frequency, is seen in the picture. A wavelength is characterized as node to node to node. Therefore, for the first harmonic, the wavelength, ʎ, is equal to 2L, L being the length of the string. Since standing waves follow the standard relationship

The instrument that we constructed to investigate different soundwaves and frequencies each mediums produce with was the vertical chimes. We changed the medium (materials) that the sound waves travelled through. The chime is made up of a newton ball, pebble, mothball and marble. Unlike the wind chimes we didn’t use wind to make the instrument play but we used a metal spoon to hit each individual materials with. This experiment was ran during class by using an app that recorded the frequency of the sound that the vertical chime was producing. We had many challenges on the way like recording the frequency with the app, controlling the variable and getting the results.

(2) The type of sound wave used for this experiment was longitudinal waves in which the vibration occurs along the direction of propagation

The era of ultrasonic began with the wrecking of RMS Titanic which crashed with ice berg. The detection of ice berg was done by high frequency waves. In 1915 Langevin (the father of ultrasonic) invented the underwater SONAR for submarine detection. Sokolov suggested the concept of ultrasonic metal flaw detection in 1928. After that slow and steady progress was made in the measurement of propagation constant of material. The propagation of ultrasonic waves through solid material has been used to detect hidden cracks, porosity, voids and other discontinuities in metal. The field of ultrasonic has wide application in science, medicine and