A 2.0-g string that is 0.67 m long is under tension The string vibrates at 700 H

Question

A 2.0-g string that is 0.67 m long is under tension The string vibrates at 700 Hz tone in its third harmonic, and this vibration causes a sound wave. What is the wavelength of the sound? The speed of sound in air is 344 m/s 0.61 0.49 0.67 0.55 0.45 You are driving along a highway at 25 m/s when you hear the siren of an emergency vehicle traveling at constant speed in the opposite direction on the other side of the highway. When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the speed of the vehicle? The speed of sound in air is 343 m/s. 41 m/s 35 m/s 32 m/s 30 m/s 50 m/s Water flowing through a cylindrical pipe suddenly comes to a section of pipe where the diameter decreases to 86% of its previous value. If the speed of the water in the larger section of the pipe was 32 m/s, what is its speed in this smaller section if the water behaves like an ideal incompressible fluid? 37 m/s 24 m/s 28 m/s 43 m/s A 4.7-kg solid sphere, made of metal whose density is 4000 kg/m^3, hangs by a light cord. When the sphere is immersed in water, what is the tension in the cord? The density of water is 1000 kg/m ^3 46 N 40 N 52 N 35 N 58 N A 0.39-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 570 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a displacement. x = + 0.080 m, and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. When the position of the block is x= 0.057 m, its kinetic energy is closest to 1.1 J. 0.84 J 0.95 J 0.90 J 1.0 J A barking dog delivers about 1.0 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level in decibels at a distance 5.00 m from the dog? The threshold of human hearing is 1.0 x 10 ^-12 W/m ^2 65 dB 63 dB 61 dB 68 dB A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 ? After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s. 69 Hz 72 Hz 71 Hz 68 Hz 70 Hz

Explanation / Answer

1) velocity v = wavelength*frequency

here given frequency = 700 Hz

here third harmonic is happend so three loops are possible

so for three harmonics length = 3*lambda/2

lambda = 2/3*l

lambda = 2/3*0.67

lamnbda = 0.45 m

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