1. The Bulk modulus of ethanol is 8.9 x 10 N/m? and the speed of sound in Ethanol is 1162 m/sec at 20 degree C. Find its density, in kg/m'. [ Hint: v = square root (B/p)] a. 766 b. 880 c. 659 d. none of these
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
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1. The Bulk modulus of ethanol is 8.9 x 10 N/m? and the speed of sound in Ethanol is 1162 m/sec at
20 degree C. Find its density, in kg/m'. [ Hint: v = square root (B/p) ]
а. 766
b. 880
С. 659
d. none of these
2. When the decibel level is increased from 27 dB to 39 dB, by how many times is the intensity
increased? ( i.e. find I, and I, then take I/I, = ? )
a. 15.8 times
b. 12 times
c. 1.44 times
d. none of these
3. Someone is speeding on the road at 89 mph (39.8. m/sec). A police car is coming from opposite
direction at 95 mph (42.5 m/s) with a siren frequency of 1200 Hz. Find the frequency heard by the
driver. Take the speed of sound at 20C as 343 m/sec.
а. 1189 Hz
b. 1528 Hz
с. 1192 Hz
d. 1211 Hz
4. The linear density of a violin string is 7.8 x 104 kg/m. A wave on the string has a frequency of 440
Hz and a wavelength of 65 cm. Find the tension on the string.
а. О.22 N
b. 63.8 N
C 0036 N
105 N
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